Latest Articles from PhytoKeys Latest 37 Articles from PhytoKeys https://phytokeys.pensoft.net/ Tue, 19 Mar 2024 10:30:49 +0200 Pensoft FeedCreator https://phytokeys.pensoft.net/i/logo.jpg Latest Articles from PhytoKeys https://phytokeys.pensoft.net/ Taxonomic revision of the native Magnolia (Magnoliaceae) species of Brazil https://phytokeys.pensoft.net/article/113277/ PhytoKeys 238: 33-64

DOI: 10.3897/phytokeys.238.113277

Authors: Juliana Cruz Jardim Barbosa, Maria Beatriz Rossi Caruzo, Ana Rita G. Simões, Marie-Stéphanie Samain

Abstract: The genus Magnolia (Magnoliaceae) has a wide and disjunct geographic distribution ranging from Eastern and South Asia to Malaysia, extending across the Neartics and reaching into the Neotropics. Regarding its infrageneric classification, the genus is divided into three subgenera: Yulania, Gynopodium and Magnolia, the latter including the section Talauma in which the native Brazilian taxa are classified. The species of Magnolia sect. Talauma can be recognized by two parallel longitudinal scars on the petiole formed by the shedding of the stipules, in addition to a woody syncarp that breaks into irregular plates at dehiscence. Currently, in Brazil, species recognition is not clear on national platforms that are widely used by the Brazilian botanical community (e.g. Flora do Brasil), with only two native Magnolia species being accepted: M. amazonica and M. ovata. The lack of knowledge about the species and their respective characteristics has resulted in many identification errors in Brazilian herbaria, which contributes to the lack of knowledge about their current conservation status. We conducted a complete taxonomic revision based on extensive fieldwork, a herbarium survey, along with literature study. Based on this, we propose to recognize three previously described species, supporting the acceptance of five native Magnolias occurring in Brazil, namely: M. amazonica, M. brasiliensis, M. irwiniana, M. ovata and M. sellowiana. However, we follow the Flora do Brasil in maintaining M. paranaensis as a synonym of M. ovata. Additionally, we designate a lectotype for M. sellowiana. We present morphological descriptions and the geographic distribution for each species, in addition to an identification key to all of these plus the two introduced ornamental species from Asia and North America, illustrations, photographs, ecological data, updated conservation status and taxonomic notes.

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Research Article Thu, 1 Feb 2024 16:08:56 +0200
Phylogenomic inference of the African tribe Monodoreae (Annonaceae) and taxonomic revision of Dennettia, Uvariodendron and Uvariopsis https://phytokeys.pensoft.net/article/103096/ PhytoKeys 233: 1-200

DOI: 10.3897/phytokeys.233.103096

Authors: Léo-Paul M. J. Dagallier, Frank M. Mbago, Marie Couderc, Myriam Gaudeul, Aurélie Grall, Caroline Loup, Jan J. Wieringa, Bonaventure Sonké, Thomas L. P. Couvreur

Abstract: Monodoreae (Annonaceae) is a tribe composed of 11 genera and 90 species restricted to the tropical African rain forests. All the genera are taxonomically well circumscribed except the species rich genera Uvariodendron and Uvariopsis which lack a recent taxonomic revision. Here, we used a robust phylogenomic approach, including all the 90 currently accepted species, with several specimens per species, and based on more than 300 Annonaceae-specific nuclear genes, to infer the phylogenetic tree of the Monodoreae and test the limits between the genera and species. We recover all the genera as monophyletic, except the genus Uvariopsis for which the species Uvariopsis tripetala falls outside this clade. We thus reinstate the monotypic genus Dennettia for its single species Dennettia tripetala. We also erect a new tribe, Ophrypetaleae trib. nov., to accommodate the genera Ophrypetalum and Sanrafaelia, as we recover them excluded from the Monodoreae tribe with good support. Below the genus level, the genera Isolona, Monodora, Uvariastrum, Uvariodendron and Uvariopsis show weakly supported nodes and phylogenetic conflicts, suggesting that population level processes of evolution might occur in these clades. Our results also support, at the molecular level, the description of several new species of Uvariodendron and Uvariopsis, as well as several new synonymies. Finally, we present a taxonomic revision of the genera Dennettia, Uvariodendron and Uvariopsis, which contain one, 18 and 17 species respectively. We provide a key to the 11 genera of the Monodoraeae and describe four new species to science: Uvariodendron kimbozaense Dagallier & Couvreur, sp. nov., Uvariodendron mossambicense Robson ex Dagallier & Couvreur, sp. nov., Uvariodendron pilosicarpum Dagallier & Couvreur, sp. nov. and Uvariopsis oligocarpa Dagallier & Couvreur, sp. nov., and provide provisional descriptions of three putatively new species. We also present lectotypifications and nomenclatural changes implying synonymies and new combinations (Uvariodendron citriodorum (Le Thomas) Dagallier & Couvreur, comb. et stat. nov., Uvariodendron fuscum var. magnificum (Verdc.) Dagallier & Couvreur, comb. et stat. nov., Uvariopsis congensis var. angustifolia Dagallier & Couvreur, var. nov., Uvariopsis guineensis var. globiflora (Keay) Dagallier & Couvreur, comb. et stat. nov., and Uvariopsis solheidii var. letestui (Pellegr.) Dagallier & Couvreur, comb. et stat. nov.).

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Monograph Fri, 22 Sep 2023 08:03:22 +0300
Desmopsis terriflora, an extraordinary new species of Annonaceae with flagelliflory https://phytokeys.pensoft.net/article/102279/ PhytoKeys 227: 181-198

DOI: 10.3897/phytokeys.227.102279

Authors: María Fernanda Martínez-Velarde, Carlos Rodrigues-Vaz, Vincent Soulé, Francis J. Nge, George E. Schatz, Thomas L. P. Couvreur, Andrés Ernesto Ortiz-Rodriguez

Abstract: Flagelliflory refers to the production of inflorescences exclusively on long, whip-like branches which emerge from the main trunk and extend along the ground or below it. It is the rarest type of cauliflory and only a few cases have been reported in the world. Here, a new species of Annonaceae with flagelliflory is described and illustrated. The phylogenetic relationships of the new species were inferred using a hybrid-capture phylogenomic approach and we present some notes on its reproductive ecology and pollen characteristics. The new species, namely Desmopsis terriflora sp. nov., is part of a clade composed of Mexican species of Stenanona with long, awned petals. Desmopsis terriflora is distinguished by its flageliflorous inflorescences, basely fused sepals, thick red petals, reduced number of ovules per carpel, pollen grains with a weakly rugulate to fossulate exine ornamentation, and its globose, apiculate fruits with a woody testa. The morphological characteristics of the flagella suggest that these are specialized branches rather than inflorescences, and the absence of ramiflory implies an exclusively reproductive function. The flowers are infrequently visited by insects, their potential pollinators being flies and ants.

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Research Article Fri, 23 Jun 2023 15:07:49 +0300
Three new species of Mitrephora (Annonaceae) from Thailand https://phytokeys.pensoft.net/article/91582/ PhytoKeys 218: 93-107

DOI: 10.3897/phytokeys.218.91582

Authors: Charan Leeratiwong, Piya Chalermglin, Richard M. K. Saunders

Abstract: Three new Mitrephora species (Annonaceae), M. langsuanensis sp. nov., M. sirindhorniae sp. nov. and M. sukhothaiensis sp. nov., are described from Thailand. Mitrephora langsuanensis resembles M. macclurei, but its leaves have more secondary veins, and its flowers have more carpels, with yellow-and-pink striped outer petals with a margin that becomes undulate with age. Mitrephora sirindhorniae resembles M. tomentosa, but has larger sepals and petals, longer flowering pedicels, and shorter monocarp stipes, with monocarps that have a longitudinal ridge. Mitrephora sukhothaiensis is distinct from its Thai congeners in having outer petals that reflex at maturity and inner petals with a pair of appendages on the margin adaxially. The addition of these three new taxa raises the total number of Mitrephora species in Thailand to 14. An identification key for Thai species is provided.

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Research Article Thu, 12 Jan 2023 10:54:56 +0200
Integrating morphological and genetic limits in the taxonomic delimitation of the Cuban taxa of Magnolia subsect. Talauma (Magnoliaceae) https://phytokeys.pensoft.net/article/82627/ PhytoKeys 213: 35-66

DOI: 10.3897/phytokeys.213.82627

Authors: Ernesto Testé, Majela Hernández-Rodríguez, Emily Veltjen, Eldis R. Bécquer, Arlet Rodríguez-Meno, Alejandro Palmarola, Marie-Stephanie Samain, Luis R. González-Torres, Thierry Robert

Abstract: An accurate taxa delimitation, based on a full understanding of evolutionary processes involved in taxa differentiation, can be gained from a combination of ecological, morphological, and molecular approaches. The taxonomy of Magnolia subsect. Talauma in Cuba has long been debated and exclusively based on traditional morphological study of a limited number of individuals. A more accurate description of leaf morphology variation using geometric morphometrics combined with genetic data could bring consistency to taxa delimitation in this group. Leaf samples for the morphological (243) and genetic (461) analyses were collected throughout the entire distribution range. The variability of each taxon was analyzed through multivariate and geometric morphometry, and 21 genetic markers (SSR). The observed leaf morphological variability was higher than previously described. Morphological and genetic classifications were highly congruent in two out of four taxa. Our data brought evidence that Magnolia orbiculata can be considered a true species with very clear genetic and morphological limits. The main taxonomic issues concern the north-eastern Cuban populations of Magnolia subsect. Talauma. The data supported the existence of two clear groups: corresponding mainly to M. minor-M. oblongifolia and T. ophiticola. However, these two groups cannot be considered fully delimited since genetic markers provided evidence of genetic admixture between them. Due to the likely absence of, at least strong, reproductive barriers between these three taxa, we propose therefore to consider them as a species complex.

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Research Article Wed, 9 Nov 2022 17:46:54 +0200
Flora of Cameroon – Annonaceae Vol 45 https://phytokeys.pensoft.net/article/61432/ PhytoKeys 207: 1-532

DOI: 10.3897/phytokeys.207.61432

Authors: Thomas L. P. Couvreur, Leo-Paul M. J. Dagallier, Francoise Crozier, Jean-Paul Ghogue, Paul H. Hoekstra, Narcisse G. Kamdem, David M. Johnson, Nancy A. Murray, Bonaventure Sonké

Abstract: Annonaceae is a major pantropical family with 113 genera and about 2550 species. Cameroon is one of the most biodiverse countries in Africa but its flora remains incompletely known. In this volume of the Flora of Cameroon, we describe 166 native taxa representing 163 species in 28 native genera within the family Annonaceae. A total of 22 species (about 13%) are endemic to the country. We provide keys to all native genera, species, and infraspecific taxa. For each species a detailed morphological description and a map of its distribution in Cameroon are provided. Distribution maps and diversity analyses are based on a taxonomically verified database of 2073 collections. Across Africa, Cameroon is a center of diversity for Annonaceae harboring one of the highest numbers of species and genera. For example, Cameroon harbors the highest number of African species for the only pantropical genus of Annonaceae, Xylopia. Annonaceae are found across all 10 administrative regions of Cameroon but diversity is concentrated within the tropical rain forest areas situated in the south and South-West. The areas around Bipindi and Mount Cameroon show the highest levels of diversity, but this is correlated with collection effort. Line drawings and/or photographs accompany most species. One species new to science Uvariopsis etugeana Dagallier & Couvreur sp. nov. is described. We also undertake a number of nomenclatural changes such as lectotypifications, six new synonymies and two new combinations (Uvaria anisotricha (Le Thomas) Couvreur, comb. nov.; Uvariodendron fuscum var. giganteum (Engl.) Dagallier & Couvreur, comb. nov.).

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Flora Tue, 20 Sep 2022 09:28:33 +0300
New Species of Virola (Myristicaceae) from South America https://phytokeys.pensoft.net/article/81367/ PhytoKeys 197: 81-148

DOI: 10.3897/phytokeys.197.81367

Authors: Daniel Santamaría-Aguilar, Laura P. Lagomarsino

Abstract: With about 70 species Virola, is the largest genus of Myristicaceae in the Neotropics, the genus ranked in the top ten genera of abundance across Amazonia. Ten new species are proposed in this striking genus, which are described based on morphology, and are illustrated. The new species were discovered thanks to herbarium specimens collected mainly in the 1980s and 1990s when field documentations were more active. The new species come from Colombia (V. calimensis sp. nov., V. cogolloi sp. nov., V. excisa sp. nov., V. tuckerae sp. nov.), Ecuador (V. alvaroperezii sp. nov., V. bombuscaroensis sp. nov., V. calimensis, V. excisa, V. yasuniana sp. nov.), Peru (V. aguarunana sp. nov., V. cumala sp. nov., V. excisa, V. parkeri sp. nov.), and Brazil (V. excisa, V. yasuniana). Additionally, a lectotype is designated for V. macrocarpa, a name used to identify some specimens of the new species here described, and V. kwatae is reported for the first time for Brazil. We provide a comparation table between the new species and the species that is morphologically close to it, a preliminary list of species for the genus, and notes of how the new species were treated in floras, checklists, or collections that need more study and herbarium specimens.

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Research Article Mon, 30 May 2022 11:16:37 +0300
Goniothalamus roseipetalus and G. sukhirinensis (Annonaceae): Two new species from Peninsular Thailand https://phytokeys.pensoft.net/article/73210/ PhytoKeys 184: 1-17

DOI: 10.3897/phytokeys.184.73210

Authors: Charan Leeratiwong, Piya Chalermglin, Richard M. K. Saunders

Abstract: Two new Goniothalamus species (Annonaceae), G. roseipetalus sp. nov. and G. sukhirinensis sp. nov., are described from the southern limits of Peninsular Thailand (Narathiwat and Yala Provinces). Both new species resemble G. macrophyllus, G. scortechinii and G. uvarioides. The addition of these two new species brings the total number of Goniothalamus species in Thailand to 27. Separate identification keys are provided for flowering and fruiting specimens of the Thai species.

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Research Article Mon, 25 Oct 2021 09:15:05 +0300
Two new species of Otoba (Myristicaceae) from Colombia https://phytokeys.pensoft.net/article/64564/ PhytoKeys 178: 147-170

DOI: 10.3897/phytokeys.178.64564

Authors: Daniel Santamaría-Aguilar, Laura P. Lagomarsino

Abstract: Otoba is the third largest genus of Myristicaceae in the Neotropics with 12 species, nine of them native to Colombia. Two new species from the department of Antioquia, O. scottmorii sp. nov. and O. squamosa sp. nov., are described and illustrated. Otoba scottmorii occurs in humid, lowland forests, while O. squamosa occurs in premontane forest. Previously, Otoba scottmorii was confused with O. acuminata (which here is considered restricted to Costa Rica and Panama), while O. squamosa was confused with O. gordoniifolia. The similarities and differences between these and other species are discussed.

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Research Article Mon, 31 May 2021 10:12:45 +0300
Artabotrys pachypetalus (Annonaceae), a new species from China https://phytokeys.pensoft.net/article/64485/ PhytoKeys 178: 71-80

DOI: 10.3897/phytokeys.178.64485

Authors: Bine Xue, Gang-Tao Wang, Xin-Xin Zhou, Yi Huang, Yi Tong, Yongquan Li, Junhao Chen

Abstract: Artabotrys pachypetalus sp. nov. is described from Guangdong, Guangxi, Guizhou, Hunan and Jiangxi in China. A detailed description, distribution data, along with a color plate and a line drawing are provided. In China, specimens representing this species were formerly misidentified as A. multiflorus or A. hongkongensis (= A. blumei). Artabotrys blumei typically has a single flower per inflorescence, whereas both Artabotrys pachypetalus and A. multiflorus have multiple flowers per inflorescence. In addition, A. pachypetalus is readily distinguished from A. multiflorus in having thicker and shorter petals, and connivent and somewhat trigonal or terete inner petal blades. Artabotrys pachypetalus is most similar to A. punctulatus because both have multi-flowered inflorescences and similar petal length, but A. pachypetalus differs in having cream petals in vivo, connivent inner petal blades, and a short, raised rim above the inner petal claw. Artabotrys multiflorus should be excluded from the flora of China because none of the Chinese specimens of Artabotrys collected so far fall within the variation of A. multiflorus.

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Research Article Thu, 27 May 2021 09:28:37 +0300
A checklist of vascular plants of Ewe-Adakplame Relic Forest in Benin, West Africa https://phytokeys.pensoft.net/article/61467/ PhytoKeys 175: 151-174

DOI: 10.3897/phytokeys.175.61467

Authors: Alfred Houngnon, Aristide C. Adomou, William D. Gosling, Peter A. Adeonipekun

Abstract: Covering 560.14 hectares in the south-east of Benin, the Ewe-Adakplame Relic Forest (EARF) is a micro-refugium that shows insular characteristics within the Dahomey Gap. It is probably one of the last remnants of tropical rain forest that would have survived the late Holocene dry period. Based on intensive field investigations through 25 plots (10 × 50 m size) and matching of herbarium specimens, a checklist of 185 species of vascular plant belonging to 54 families and 142 genera is presented for this forest. In addition to the name for each taxon, we described the life form following Raunkiaer’s definitions, chorology as well as threats to habitat. The Rubiaceae family was the richest (20 species) followed by the Fabaceae (15 species). Life forms showed the preponderance of phanerophytes (88%). The Chorological spectrum was dominated by Guineo-Congolean species (66%). Species richness estimated were 200.52 ± 9.2808 for Bootstrap; 217.62 ± 14.5972; 224.16 ± 15.3725 and 242.67 respectively for Chao, Jacknife1 and Jacknife2. Bootstrap appears to be the estimation closer to the field records. In Benin, EARF is home for Rinorea species described as West African forest bio-indicators and single location for Nesogordonia papaverifera, Mansonia altissima, Englerophytum oblanceolatum, Octolobus spectabilis, Vitex micrantha and most of Drypeteae tribe species (Drypetes aframensis, Drypetes afzelii, Drypetes gilgiana and Drypetes leonensis) recorded in Benin. Our results provides baseline information for further in-depth analysis of vegetation history in Benin by raising the question on the past floristic connection of the Dahomey gap and community engagement in conservation.

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Checklist Mon, 12 Apr 2021 13:21:17 +0300
Three new species of Uvariodendron (Annonaceae) from coastal East Africa in Kenya and Tanzania https://phytokeys.pensoft.net/article/61630/ PhytoKeys 174: 107-126

DOI: 10.3897/phytokeys.174.61630

Authors: Léo-Paul M.J. Dagallier, Frank M. Mbago, W.R. Quentin Luke, Thomas L.P. Couvreur

Abstract: East Africa is a hotspot of biodiversity with many endemic plant species. We describe three new species of the genus Uvariodendron (Annonaceae) from the coastal forests of Kenya and Tanzania. Uvariodendron mbagoi Dagallier & Couvreur, sp. nov. is endemic to Tanzania and unique within the genus by its strong bergamot scent and its tomentose fruits having regular tufts of higher hair density. Uvariodendron dzomboense Dagallier, W.R.Q. Luke & Couvreur, sp. nov. is endemic to Dzombo Hill in Kenya and is rendered distinct by its small leaves and very densely pubescent carpels. Uvariodendron schmidtii W.R.Q. Luke, Dagallier & Couvreur, sp. nov. is endemic to Shimba Hills in Kenya and differs by its small flowers and fused sepals forming a ring. Following IUCN criteria we assessed U. mbagoi and U. dzomboense as endangered (EN) while U. schmidtii is assessed as Vulnerable (VU). We also propose a new combination: Polyceratocarpus oligocarpus (Verdc.) Dagallier, comb. nov. The description of these three new species underlines the richness in endemics in East Africa and that new discoveries might arise from further botanical exploration of this region.

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Research Article Fri, 12 Mar 2021 12:40:54 +0200
A second species of Pseuduvaria in China: the identity of the enigmatic species Meiogyne kwangtungensis https://phytokeys.pensoft.net/article/61025/ PhytoKeys 172: 1-15

DOI: 10.3897/phytokeys.172.61025

Authors: Qing-Long Wang, Hui Zhang, Yun-Yun Shao, Zhu-Nian Wang, Bine Xue

Abstract: Meiogyne kwangtungensis is a rare species endemic to Hainan, China, known just from two fruiting collections made in the 1930s. Although it was published under the name Meiogyne in 1976, it was suggested that it might be better placed within Pseuduvaria or Mitrephora. For decades, this species was never collected again, thus its true generic affinity remained unresolved due to the lack of flowers. During a field exploration in Hainan, we re-discovered this species and collected a flowering specimen for the first time. The flower immediately confirmed its affinity with Pseuduvaria. Phylogenetic analyses of five chloroplast regions (psbA-trnH, trnL-F, matK, rbcL, and atpB-rbcL; ca. 4.2 kb, 70 accessions) also unambiguously placed Meiogyne kwangtungensis in the Pseuduvaria clade (PP = 1.00, ML BS = 99%). Morphologically, it is most similar to P. multiovulata which is endemic to Myanmar and Thailand, both with often-paired flowers, long pedicels and short peduncles, and often 1–2 monocarps. However, it differs in having smaller flowers with kidney-shaped glands on the inner petals, fewer stamens and carpels, smaller ovoid monocarps with an apicule and fewer seeds. On the basis of the combined molecular phylogenetic and morphological data, we propose a new combination, Pseuduvaria kwangtungensis (P.T.Li) Qing L.Wang & B.Xue. A full description including floral characters and a color plate are provided here for this species. A key to species in the genus Pseuduvaria in China is also provided.

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Research Article Fri, 29 Jan 2021 11:28:19 +0200
Phylogenetic relationships of 'Polyalthia' in Fiji https://phytokeys.pensoft.net/article/57094/ PhytoKeys 165: 99-113

DOI: 10.3897/phytokeys.165.57094

Authors: Bine Xue, Yanwen Chen, Richard M. K. Saunders

Abstract: The genus Polyalthia (Annonaceae) has undergone dramatic taxonomic changes in recent years. Nine Polyalthia species have historically been recognized in Fiji, all of which have subsequently been transferred to three different genera, viz. Goniothalamus, Huberantha and Meiogyne. The transfer of six of these species has received strong molecular phylogenetic support, although the other three species, Polyalthia amoena, P. capillata and P. loriformis [all transferred to Huberantha], have never previously been sampled in a phylogenetic study. We address this shortfall by sampling available herbarium specimens of all three species and integrating the data in a molecular phylogenetic analysis. The resultant phylogeny provides strong support for the transfer of these species to Huberantha. The taxonomic realignment of all nine Fijian species formerly classified in Polyalthia is also clearly demonstrated and supported by the resultant phylogeny. The updated taxonomic treatments of the nine species, a key to the three genera and a key to the Fijian Huberantha species are provided.

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Research Article Wed, 28 Oct 2020 09:48:46 +0200
New species and new records of Artabotrys (Annonaceae) from peninsular Thailand https://phytokeys.pensoft.net/article/51643/ PhytoKeys 151: 67-81

DOI: 10.3897/phytokeys.151.51643

Authors: Junhao Chen, Wichan Eiadthong

Abstract: Two new species of Artabotrys (Annonaceae) are described from peninsular Thailand. Artabotrys longipetalus J.Chen & Eiadthong, sp. nov., is unique among Artabotrys species in Thailand in having linear petals, relatively long flower pedicels and sessile monocarps. Artabotrys insurae J.Chen & Eiadthong, sp. nov., resembles Artabotrys uniflorus (Griff.) Craib, but can be distinguished by its oblique leaf base, flat petal blades, apiculate anther connective apex and the presence of a monocarp stipe. In addition, two new records for the Flora of Thailand are reported, viz. Artabotrys crassifolius Hook.f. & Thomson and Artabotrys pleurocarpus Maingay ex Hook.f. & Thomson; both species are so far only known from peninsular Thailand. A key to the 20 species of Artabotrys in Thailand is provided.

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Research Article Wed, 17 Jun 2020 10:26:03 +0300
From Polyalthia to Polyalthiopsis (Annonaceae): transfer of species enlarges a previously monotypic genus https://phytokeys.pensoft.net/article/50929/ PhytoKeys 148: 71-91

DOI: 10.3897/phytokeys.148.50929

Authors: Bine Xue, Hong-Bo Ding, Gang Yao, Yun-Yun Shao, Xiao-Jing Fan, Yun-Hong Tan

Abstract: The genus Polyalthiopsis Chaowasku (Annonaceae) was a poorly known monotypic genus from Vietnam that was recently segregated from the highly polyphyletic genus Polyalthia s.l. The sister clade relationship between Polyalthiopsis and Miliusa was not well established in previous study. The phylogenetic position of two Polyalthia spp. from China, P. chinensis S.K.Wu ex P.T.Li and P. verrucipes C.Y.Wu ex P.T.Li, remains unresolved and is shown here to be phylogenetically affiliated with Polyalthiopsis. Phylogenetic analyses of six chloroplast regions (matK, ndhF, psbA-trnH, rbcL, trnL-F and ycf1; ca.7.3 kb, 60 accessions) unambiguously placed Polyalthia chinensis and P. verrucipes in the same clade with Polyalthiopsis floribunda (PP = 1, MP BS = 97%); the entire clade is sister to Miliusa with weak to strong support (PP = 1, MP BS = 54%). Polyalthia chinensis and P. verrucipes share several diagnostic characters with Polyalthiopsis floribunda, including the raised midrib on the upper surface of the leaf in vivo, conspicuous foliar glands when dried, petiole with transverse striations when dried and axillary inflorescences. The two species differ from Polyalthiopsis floribunda in having fewer flowers per inflorescence, longer linear petals and two ovules per carpel. On the basis of the combined molecular phylogenetic and morphological data, we propose two new combinations, Polyalthiopsis chinensis (S.K.Wu ex P.T.Li) B.Xue & Y.H.Tan and Polyalthiopsis verrucipes (C.Y.Wu ex P.T.Li) B.Xue & Y.H.Tan. The protologue of Polyalthia verrucipes did not include a description of the flowers, which we provide here. An updated description for the genus Polyalthiopsis and a key to species in the genus Polyalthiopsis is also provided.

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Research Article Tue, 26 May 2020 09:35:04 +0300
Twenty-six additional new combinations in the Magnolia (Magnoliaceae) of China and Vietnam https://phytokeys.pensoft.net/article/52114/ PhytoKeys 146: 1-35

DOI: 10.3897/phytokeys.146.52114

Authors: Christopher B. Callaghan, Siak K. Png

Abstract: In accordance with the previous reduction of the remaining genera of subfamily Magnolioideae (Magnoliaceae) into the genus Magnolia, twenty-six new nomenclatural combinations are formally made by transferring to Magnolia some additional Chinese and Vietnamese taxa from the segregate genera of Manglietia, Michelia and Yulania. The following nine new combinations are created from Manglietia, namely Magnolia admirabilis, M. albistaminea, M. guangnanica, M. jinggangshanensis, M. maguanica, M. pubipedunculata, M. pubipetala, M. rufisyncarpa and M. sinoconifera. Also, twelve new combinations are created from Michelia, namely Magnolia caloptila, M. caudata, M. fallax, M. gelida, M. hunanensis, M. maudiae var. rubicunda, M. multitepala, M. platypetala, M. rubriflora, M. septipetala, M. sonlaensis, M. xinningia. Finally, five new combinations are created from Yulania, namely Magnolia baotaina, M. pendula, M. pilocarpa var. ellipticifolia, M. puberula and M. urceolata.

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Research Article Thu, 30 Apr 2020 09:37:09 +0300
A new species and two new records of Goniothalamus (Annonaceae) from Lao PDR https://phytokeys.pensoft.net/article/38995/ PhytoKeys 138: 17-25

DOI: 10.3897/phytokeys.138.38995

Authors: Bin Yang, Ren-Bin Zhu, Hong-Bo Ding, Somsanith Bouamanivong, Yun-Hong Tan

Abstract: Goniothalamus saccopetaloides Y.H. Tan & Bin Yang, a new species is described and illustrated from Laos. This species shows morphological similarities to G. yunnanensis W.T. Wang, but it differs from the latter by having almost fleshy, involute and saccate outer petals, subglobose monocarps, and single seeded monocarps. Goniothalamus cheliensis, and G. calvicarpus are new records for the Flora of Lao PDR. A key to Goniothalamus species indigenous to Laos is provided here.

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Research Article Fri, 10 Jan 2020 14:29:03 +0200
A taxonomic synopsis of Virola (Myristicaceae) in Mesoamerica, including six new species https://phytokeys.pensoft.net/article/37979/ PhytoKeys 134: 1-82

DOI: 10.3897/phytokeys.134.37979

Authors: Daniel Santamaría-Aguilar, Reinaldo Aguilar, Laura P. Lagomarsino

Abstract: A taxonomic synopsis of Virola (Myristicaceae) is presented for Mesoamerica. Fourteen species are recognised, amongst them six are described and published as new, based on morphology: V. allenii D.Santam. & Aguilar, sp. nov. from Costa Rica, V. otobifolia D.Santam., sp. nov. from Panama and V. amistadensis D.Santam., sp. nov., V. chrysocarpa D.Santam. & Aguilar, sp. nov., V. fosteri D.Santam., sp. nov. and V. montana D.Santam., sp. nov. from both Costa Rica and Panama. Additionally, a lectotype is designated for V. koschnyi, accompanied by an epitype in view of the fragmentary material. Finally, we recognise V. laevigata and V. nobilis as morphologically distinct species, though these are frequently considered synonymys of V. guatemalensis and V. surinamensis, respectively. Of the fourteen accepted species, twelve of them are endemic to Mesoamerica, while the remaining two species (V. elongata and V. sebifera) extend into South America. Illustrations, species diagnoses and distribution maps for each species are provided, as is an identification key to all species.

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Research Article Wed, 23 Oct 2019 10:25:07 +0300
Twelve new and exciting Annonaceae from the Neotropics https://phytokeys.pensoft.net/article/33913/ PhytoKeys 126: 25-69

DOI: 10.3897/phytokeys.126.33913

Authors: Paul J.M. Maas, Lubbert Y.Th. Westra, Lars W. Chatrou, Nadja Verspagen, Heimo Rainer, Nelson A. Zamora, Roy H.J. Erkens

Abstract: As a result of concerted efforts of the community of Annonaceae taxonomists, increasingly detailed knowledge of the diversity of the Neotropical genera has been documented. With the exception of just two large genera, Annona and Xylopia, all Neotropical Annonaceae have been revised within the last 25 years. Subsequent to these publications, many new specimens have been collected and sent to us in Leiden for identification. These included a number that, despite the advanced state of taxonomic knowledge, proved to represent rarely collected, undescribed species. Here we describe 12 new species of Annona, Guatteria, Klarobelia, Tetrameranthus, and Xylopia. These species serve to illustrate the still underestimated diversity of the Neotropical flora, even in well studied plant groups like Annonaceae.

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Research Article Tue, 2 Jul 2019 14:51:04 +0300
Mitrephora monocarpa (Annonaceae): a new species from Surat Thani Province, Peninsular Thailand https://phytokeys.pensoft.net/article/34271/ PhytoKeys 121: 73-80

DOI: 10.3897/phytokeys.121.34271

Authors: Richard M.K. Saunders, Piya Chalermglin

Abstract: A new species, Mitrephora monocarpa R.M.K.Saunders & Chalermglin, sp. nov. (Annonaceae), is described from Surat Thani Province in Peninsular Thailand. It resembles two other species, M. alba Ridl. and M. keithii Ridl., with which it is broadly sympatric, but can be distinguished by its solitary flowers (not borne in thyrsoid inflorescences as in most other Mitrephora species), single carpel per flower (and hence single monocarp per fruit) and the lack of a monocarp stipe. A key to the nine Mitrephora species in Thailand is provided.

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Research Article Tue, 7 May 2019 11:32:23 +0300
Taxonomic revision of the African genus Greenwayodendron (Annonaceae) https://phytokeys.pensoft.net/article/27395/ PhytoKeys 114: 55-93

DOI: 10.3897/phytokeys.114.27395

Authors: Brandet-Junior Lissambou, Olivier J. Hardy, Christiane Atteke, Tariq Stevart, Gilles Dauby, Bertrand Mbatchi, Bonaventure Sonke, Thomas L.P. Couvreur

Abstract: Greenwayodendron (Annonaceae) is a tropical African genus of trees occurring mainly in rain forests. Until recently, Greenwayodendron contained only two species: Greenwayodendron oliveri from West Africa and Greenwayodendron suaveolens from Central and East Africa. Genetic data, using chloroplast haplotypes and nuclear microsatellites as well as morphometric analyses, provided important information on the delineation of species. Greenwayodendron now contains six species, including two new species (Greenwayodendron glabrum Lissambou, Hardy & Couvreur, sp. nov. and Greenwayodendron littorale Lissambou, Dauby & Couvreur, sp. nov.). Greenwayodendron suaveolens var. gabonica and Greenwayodendron suaveolens subsp. usambaricum are recognised as distinct species: Greenwayodendron gabonicum comb. nov. and Greenwayodendron usambaricum comb. nov., respectively. A key, detailed descriptions of morphology and geographic distributions, as well as notes on their ecology and uses are presented for all species. Preliminary conservation assessments following IUCN criteria are also provided. Two species are preliminarily identified as threatened, one as Endangered and one as Vulnerable.

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Research Article Mon, 31 Dec 2018 12:00:18 +0200
A taxonomic revision of the Neotropical genus Cremastosperma (Annonaceae), including five new species https://phytokeys.pensoft.net/article/24897/ PhytoKeys 112: 1-141

DOI: 10.3897/phytokeys.112.24897

Authors: Michael D. Pirie, Lars W. Chatrou, Paul J. M. Maas

Abstract: We present a taxonomic revision of Cremastosperma, a genus of Neotropical Annonaceae occurring in lowland to premontane wet forest, mostly in areas surrounding the Andean mountain chain. We recognise 34 species, describing five as new here: from east of the Andes, C. brachypodum Pirie & Chatrou, sp. nov. and C. dolichopodum Pirie & Maas, sp. nov., endemic to Peru; C. confusum Pirie, sp. nov., from southern Peru and adjacent Bolivia and Brazil; and C. alticola Pirie & Chatrou, sp. nov., at higher elevations in northern Peru and Ecuador; and from west of the Andes, C. osicola Pirie & Chatrou, sp. nov. endemic to Costa Rica, the most northerly distributed species of the genus. We provide an identification key, document diagnostic characters and distributions and provide illustrations and extensive lists of specimens, also presenting the latter in the form of mapping data with embedded links to images available online. Of the 34 species, 22 are regional endemics. On the basis of the extent of occurrence and area of occupancy of species estimated from the distribution data, we designate IUCN threat categries for all species. Fourteen species proved to be endangered (EN) and a further one critically endangered (CR), reflecting their rarity and narrow known distributions.

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Monograph Mon, 26 Nov 2018 11:10:42 +0200
A revision of Xylopia L. (Annonaceae): the species of Tropical Africa https://phytokeys.pensoft.net/article/20975/ PhytoKeys 97: 1-252

DOI: 10.3897/phytokeys.97.20975

Authors: David M. Johnson, Nancy A. Murray

Abstract: A revision of the 45 species of the pantropical genus Xylopia in Tropical Africa includes descriptions of six new species and a new section of the genus. The fruits and seeds of Xylopia show specializations that promote vertebrate dispersal, primarily by hornbills and monkeys. Over half of the African species have an Area of Occupancy (AOO) less than 80 km2, suggesting that they are in need of protection. African species are classified into five sections. Section Neoxylopia , with four species, is centered in the Guineo-Congolian Region and includes X. globosa sp. nov. Section Ancistropetala, with three species, occurs in the same region. Both of these sections are endemic to Africa. Section Xylopia, which extends to Madagascar and the American tropics, has only a single species in Africa, X. aethiopica. The three species of section Verdcourtiasect. nov. are restricted to the East African coast and Madagascar. The largest number of African species, (34) belong to section Stenoxylopia, in which the seeds lack the arils found in the other sections and instead have a fleshy sarcotesta. Section Stenoxylopia is divided into two informal groups, one centered in eastern and southern Africa (X. odoratissima group) and the other centered in the wetter forests of western and central Africa (X. acutiflora group). Five new species are described in section Stenoxylopia: Xylopia nilotica sp. nov. from Sudan, South Sudan, and Uganda, Xylopia calva sp. nov. from Nigeria and Cameroon, which is allied to X. phloiodora, and Xylopia monticola sp. nov. from Nigeria and Cameroon, X. piratae sp. nov. from Ivory Coast and Ghana, and X. unguiculata sp. nov. from Gabon. The latter three species are segregates of the former Xylopia acutiflora s. l. One new combination is made at the species level, X. shirensis comb. nov. Keys, descriptions, illustrations, distribution maps, and an index to numbered collections document diversity and assist with species identification. The name Unona oliveriana Baill. was found to pre-date the name Unona lepidota Oliv., requiring the combination Meiocarpidium oliverianum comb. nov.

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Monograph Tue, 24 Apr 2018 16:21:59 +0300
Two new species and two new records of Artabotrys (Annonaceae) from Thailand https://phytokeys.pensoft.net/article/23434/ PhytoKeys 95: 71-81

DOI: 10.3897/phytokeys.95.23434

Authors: Junhao Chen, Piya Chalermglin, Richard M.K. Saunders

Abstract: Two new species of Artabotrys are described from Thailand. Artabotrys tanaosriensis J.Chen, Chalermglin & R.M.K.Saunders, sp. nov., is similar to A. oblanceolatus Craib but differs in its symmetrical, cuneate or decurrent leaf base, externally distinct outer petal blades and claws, deltoid and undulate outer petal blades, rhomboid and undulate inner petal blades and shorter, subsessile and slightly beaked monocarps. Artabotrys spathulatus J.Chen, Chalermglin & R.M.K.Saunders, sp. nov., is most similar to A. tanaosriensis but differs in having flat outer petal blades, broadly rhomboid outer petal claws, broadly spathulate and strongly concave inner petal blades and strongly beaked monocarps. Two new records for the Flora of Thailand are furthermore reported here: A. punctulatus C.Y.Wu ex S.H.Yuan and A. byrsophyllus I.M.Turner & Utteridge, which were previously confused with A. aeneus Ast and A. grandifolius King, respectively. A key to Artabotrys species indigenous to Thailand is provided here.

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Research Article Wed, 7 Feb 2018 14:13:15 +0200
Two new species of Trivalvaria (Annonaceae) from northern Myanmar https://phytokeys.pensoft.net/article/21553/ PhytoKeys 94: 3-12

DOI: 10.3897/phytokeys.94.21553

Authors: Bin Yang, Shi-Shun Zhou, Hong-Bo Ding, Ren Li, Kyaw Win Maung, Yun-Hong Tan

Abstract: Trivalvaria rubra and Trivalvaria casseabriae, two new species of Annonaceae from Putao, Kachin State, Myanmar, are here described and illustrated. They are morphologically similar to T. costata and T. macrophylla. The major differences between them are outlined and discussed. A diagnostic key to the species of Trivalvaria is provided.

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Research Article Mon, 29 Jan 2018 15:01:45 +0200
Revisions of Ruizodendron and Pseudephedranthus (Annonaceae) including a new species and an overview of most up-to-date revisions of Neotropical Annonaceae genera https://phytokeys.pensoft.net/article/13773/ PhytoKeys 86: 75-96

DOI: 10.3897/phytokeys.86.13773

Authors: Roy Erkens, Jessica Oosterhof, Lubbert Y.Th. Westra, Paul J.M. Maas

Abstract: We present revisions of the Neotropical genera Ruizodendron and Pseudephedranthus (Annonaceae). Ruizodendron includes a single species R. ovale. Pseudephedranthus now comprises two species, with the description of the new species P. enigmaticus sp. nov. extending the range of the genus beyond the Upper Rio Negro region of Brazil (Amazonas) and adjacent Venezuela (P. fragrans), to include Guyana, Suriname, and the Brazilian state of Pará. An overview is provided of current revisions of Neotropical Annonaceae genera that will aid in accessing proper species information for this frequently encountered tropical rain forest family.

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Research Article Thu, 21 Sep 2017 11:34:13 +0300
A nonet of novel species of Monanthotaxis (Annonaceae) from around Africa https://phytokeys.pensoft.net/article/9292/ PhytoKeys 69: 71-103

DOI: 10.3897/phytokeys.69.9292

Authors: Paul H. Hoekstra, Jan J. Wieringa, Lars W. Chatrou

Abstract: As part of an ongoing revision of the genus Monanthotaxis Baill. (Annonaceae), nine new species are described and one variety is reinstated to species rank. Two new species from West Africa (Monanthotaxis aquila P.H.Hoekstra, sp. nov. and Monanthotaxis atewensis P.H.Hoekstra, sp. nov.), four new species from Central Africa (Monanthotaxis couvreurii P.H.Hoekstra, sp. nov., Monanthotaxis latistamina P.H.Hoekstra, sp. nov., Monanthotaxis tripetala P.H.Hoekstra, sp. nov. and Monanthotaxis zenkeri P.H.Hoekstra, sp. nov.), one new species from Tanzania (Monanthotaxis filipes P.H.Hoekstra, sp. nov.), one new species from the area around Maputo (Monanthotaxis maputensis P.H.Hoekstra, sp. nov.), one new species from the Comoro Islands (Monanthotaxis komorensis P.H.Hoekstra, sp. nov.) and Monanthotaxis klainei (Engl.) Verdc. var. angustifolia (Boutique) Verdc. is raised to species level leading to the replacement name Monanthotaxis atopostema P.H.Hoekstra, nom. nov. (not Monanthotaxis angustifolia (Exell) Verdc.). Complete descriptions, comparisons with related species, ecological information and IUCN conservation assessments are given for the new species. Five species were classified as critical endangered, two species as endangered, one as vulnerable and one as least concern, warranting the need of further collecting and studying those species.

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Research Article Tue, 30 Aug 2016 14:17:32 +0300
New species of Uvariopsis (Annonaceae) and Laccosperma (Arecaceae/Palmae) from Monts de Cristal, Gabon https://phytokeys.pensoft.net/article/9576/ PhytoKeys 68: 1-8

DOI: 10.3897/phytokeys.68.9576

Authors: Thomas L.P. Couvreur, Raoul Niangadouma

Abstract: Monts de Cristal National Park in northwest Gabon is one of the most species rich places in Central Africa. Here, we describe two new species, one in Annonaceae and one in palms. Uvariopsis citrata Couvreur & Niangadouma, sp. nov. is unique in the genus by emitting a strong lemon scent from the crushed leaves and young branches. Laccosperma cristalensis Couvreur & Niangadouma, sp. nov. is a rattan that lacks acanthophylls on the cirrus and has few pinnae. Complete descriptions, photographic illustrations, ecological information and preliminary IUCN conservation status are provided. For both species a data deficient (DD) status is proposed. These new species underline once again that the Monts de Cristal National Park is yet incompletely known botanically.

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Research Article Tue, 2 Aug 2016 14:17:37 +0300
Popowia bachmaensis (Annonaceae), a new species from Bach Ma National Park, Central Vietnam https://phytokeys.pensoft.net/article/8792/ PhytoKeys 65: 125-131

DOI: 10.3897/phytokeys.65.8792

Authors: Nguyen Van Ngoc, Shuichiro Tagane, Hoang Thi Binh, Hironori Toyama, Norikazu Okabe, Chinh Nguyen Duy, Tetsukazu Yahara

Abstract: A new species, Popowia bachmaensis Ngoc, Tagane & Yahara, sp. nov. is described from Bach Ma National Park in Thua Thien Hue Province, Central Vietnam. This species is morphologically similar to Popowia pisocarpa (Blume) Endl. ex Walp., but can be readily distinguished from it by its lower stems, smaller leaves, shorter flowering pedicels, shorter carpels, longer sepals and inner petals. A detailed description, comprising illustrations, and supplemented with DNA barcodes of the two regions of rbcL and matK, are provided.

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Research Article Tue, 12 Jul 2016 11:07:02 +0300
A new species in the tree genus Polyceratocarpus (Annonaceae) from the Udzungwa Mountains of Tanzania https://phytokeys.pensoft.net/article/6262/ PhytoKeys 63: 63-76

DOI: 10.3897/phytokeys.63.6262

Authors: Andrew R. Marshall, Thomas L.P. Couvreur, Abigail L. Summers, Nicolas J. Deere, W.R. Quentin Luke, Henry J. Ndangalasi, Sue Sparrow, David M. Johnson

Abstract: Polyceratocarpus askhambryan-iringae, an endemic tree species of Annonaceae from the Udzungwa Mountains of Tanzania, is described and illustrated. The new species is identified as a member of the genus Polyceratocarpus by the combination of staminate and bisexual flowers, axillary inflorescences, subequal outer and inner petals, and multi-seeded monocarps with pitted seeds. From P. scheffleri, with which it has previously been confused, it differs in the longer pedicels, smaller and thinner petals, shorter bracts, and by generally smaller, less curved monocarps that have a clear stipe and usually have fewer seeds. Because P. askhambryan-iringae has a restricted extent of occurrence, area of occupancy, and ongoing degradation of its forest habitat, we recommend classification of it as Endangered (EN) on the IUCN Red List.

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Research Article Wed, 1 Jun 2016 14:33:40 +0300
Goniothalamus flagellistylus Tagane & V. S. Dang (Annonaceae), a new species from Mt. Hon Ba, Vietnam https://phytokeys.pensoft.net/article/4427/ PhytoKeys 50: 1-8

DOI: 10.3897/phytokeys.50.4427

Authors: Shuichiro Tagane, Son Van Dang, Tetsukazu Yahara, Hironori Toyama, Hop Tran

Abstract: A new species, Goniothalamus flagellistylus Tagane & V. S. Dang, sp. nov. from Hon Ba Nature Reserve in Khanh Hoa Province, South Vietnam is described and illustrated. This species is most similar to Goniothalamus tortilipetalus M.R.Hend., but distinct in having 308–336 stamens (vs. ca. 170–260) and ca.120 carpels (vs. ca. 50–100) per flower, and Stigma and pseudostyles ca.8.5 mm (vs. 4–4.5 mm) long.

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Research Article Wed, 13 May 2015 01:41:00 +0300
Sirdavidia, an extraordinary new genus of Annonaceae from Gabon https://phytokeys.pensoft.net/article/4665/ PhytoKeys 46: 1-19

DOI: 10.3897/phytokeys.46.8937

Authors: Thomas L.P. Couvreur, Raoul Niangadouma, Bonaventure Sonké, Hervé Sauquet

Abstract: A distinctive new monotypic genus from Gabon is described in the tropical plant family Annonaceae: Sirdavidia, in honor to Sir David Attenborough. Molecular phylogenetic analyses confirm that Sirdavidia, which is very distinct from a morphological standpoint, is not nested in any existing genus of Annonaceae and belongs to tribe Piptostigmateae (subfamily Malmeoideae), which now contains a total of six genera. The genus is characterized by long acuminate leaves, fully reflexed red petals, 16–19 bright yellow, loosely arranged stamens forming a cone, and a single carpel topped by a conspicuous stigma. With just three known collections, a preliminary IUCN conservation status assessment is provided as “endangered” as well as a distribution map. The discovery of Sirdavidia is remarkable at several levels. First, it was collected near the road in one of the botanically best-known regions of Gabon: Monts de Cristal National Park. Second, its sister group is the genus Mwasumbia, also monotypic, endemic to a small area in a forest in Tanzania, some 3000 km away. Finally, the floral morphology is highly suggestive of a buzz pollination syndrome. If confirmed, this would be the first documentation of such a pollination syndrome in Magnoliidae and early-diverging angiosperms in general.

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Research Article Wed, 4 Feb 2015 00:00:00 +0200
Revision of the African genus Uvariastrum (Annonaceae) https://phytokeys.pensoft.net/article/1509/ PhytoKeys 33: 1-40

DOI: 10.3897/phytokeys.33.5907

Authors: Thomas Couvreur

Abstract: The genus Uvariastrum (Annonaceae) is restricted to continental Africa and is characterized by sepals with folded margins, few carpels and numerous stamens. The genus is mainly found in the tropical lowland rain forests of Africa, with one species growing in a drier woodland habitat. The species name U. pynaertii De Wild is reduced into synonymy with U. zenkeri Engl. & Diels. Uvaraistrum neglectum Paiva and U. modestum Diels are transferred to the genus Uvaria leading to two new combinations: Uvaria modesta (Diels) Couvreur, comb. nov. and Uvaria paivana Couvreur, nom. nov.. Five species are currently recognized in Uvariastrum. The present revision, the first of the genus for over 100 years, provides an overview of previously published information and discussions on morphology, taxonomy and palynology. Preliminary conservation status assessments are provided for each species, as well as diagnostic keys for fruiting and flowering material as well as detailed species descriptions. Furthermore, all species are illustrated by line drawings and all species are mapped.

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Monograph Thu, 16 Jan 2014 00:00:00 +0200
A new species of Goniothalamus (Annonaceae) from Palawan, and a new nomenclatural combination in the genus from Fiji https://phytokeys.pensoft.net/article/1504/ PhytoKeys 32: 27-35

DOI: 10.3897/phytokeys.32.6663

Authors: Chin Cheung Tang, Bine Xue, Richard Saunders

Abstract: A new species, Goniothalamus palawanensis C.C.Tang & R.M.K.Saunders, sp. nov. (Annonaceae), is described from Palawan, Philippines. Goniothalamus palawanensis is most closely related to G. amuyon (Blanco) Merr., but differs in its shorter inner petals, hairy ovaries, and funnel-shaped stigmas. A new nomenclatural combination, G.angustifolius (A.C.Sm.) B.Xue & R.M.K.Saunders, comb. nov., is furthermore validated to reflect the phylogenetic affinities of a Fijian species previously assigned to Polyalthia.

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Research Article Wed, 18 Dec 2013 00:00:00 +0200
Contribution to the taxonomy of Garcinia (Clusiaceae) in Africa, including two new species from Gabon and a key to the Lower Guinean species https://phytokeys.pensoft.net/article/1438/ PhytoKeys 17: 41-62

DOI: 10.3897/phytokeys.17.3114

Authors: Marc Sosef, Gilles Dauby

Abstract: Garcinia has some 260 species and is often regarded as a genus with a difficult taxonomy. No recent treatment is available for the botanically rich Lower Guinea phytogeographical region. This study aims at partly filling this gap. First, several taxonomic problems are solved. G. chromocarpa is reduced to a variety of G. quadrifaria. G. gnetoides and G. granulata are both synonyms of G. quadrifaria. G. zenkeri is a synonym of G. densivenia and lectotypes are being designated for both names. G. brevipedicellata is a synonym of G. afzelii, as is G. antidysenterica for which a lectotype is designated. Second, two new species endemic to Gabon are described: Garcinia gabonensis Sosef & Dauby and Garcinia obliqua Sosef & Dauby. Finally, an identification key to all species present in the Lower Guinea region is provided. A few remaining West African species names could not be placed with certainty, because the type material was lost or not traced yet. One is a Rutaceae while the remaining three are provisionally to be regarded as synonyms of G. smeathmannii.

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Research Article Wed, 24 Oct 2012 00:00:00 +0300
Tetrameranthus (Annonaceae) revisited including a new species https://phytokeys.pensoft.net/article/1422/ PhytoKeys 12: 1-21

DOI: 10.3897/phytokeys.12.2771

Authors: Lubbert Y.Th. Westra, Paul J.M. Maas

Abstract: The taxonomic revision of the infrequently collected genus Tetrameranthus by Westra (1985) is updated. A new species is described from French Guiana and Amapá, Brazil, increasing the number of species in this genus to seven.

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Research Article Thu, 19 Apr 2012 00:00:00 +0300