Latest Articles from PhytoKeys Latest 7 Articles from PhytoKeys https://phytokeys.pensoft.net/ Fri, 29 Mar 2024 02:27:35 +0200 Pensoft FeedCreator https://phytokeys.pensoft.net/i/logo.jpg Latest Articles from PhytoKeys https://phytokeys.pensoft.net/ Re-establishment of Silene neglecta Ten. (Caryophyllaceae) with taxonomic notes on some related taxa https://phytokeys.pensoft.net/article/81370/ PhytoKeys 195: 143-160

DOI: 10.3897/phytokeys.195.81370

Authors: Llorenç Sáez, Melilia Mesbah, Javier López-Alvarado, Gianluigi Bacchetta, Ridha El Mokni, Lorenzo Peruzzi, Bengt Oxelman

Abstract: Silene neglecta has been misunderstood and confused with S. nocturna, although several morphological characters (petal shape, calyx indumentum, hairiness of stamen filaments, seed size, seed-coat surface and shape) allow separation of these species. Moreover, S. mutabilis (which has been considered conspecific with S. neglecta) and S. martinolii (an alleged endemic species to south-western Sardinia) are considered here as taxonomic synonyms of S. nocturna and S. neglecta, respectively. These taxonomic conclusions are strongly supported by multivariate morphometric analyses of 21 characters.

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Research Article Wed, 11 May 2022 11:45:11 +0300
Scorzonera sensu lato (Asteraceae, Cichorieae) – taxonomic reassessment in the light of new molecular phylogenetic and carpological analyses https://phytokeys.pensoft.net/article/46544/ PhytoKeys 137: 1-85

DOI: 10.3897/phytokeys.137.46544

Authors: Maxim A. Zaika, Norbert Kilian, Katy Jones, Anastasiya A. Krinitsina, Maya V. Nilova, Anna S. Speranskaya, Alexander P. Sukhorukov

Abstract: Scorzonera comprises 180–190 species and belongs to the subtribe Scorzonerinae. Its circumscription has long been the subject of debate and available molecular phylogenetic analyses affirmed the polyphyly of Scorzonera in its wide sense. We provide a re-evaluation of Scorzonera and other related genera, based on carpological (including anatomical) and extended molecular phylogenetic analyses. We present, for the first time, a comprehensive sampling, including Scorzonera in its widest sense and all other genera recognised in the Scorzonerinae. We conducted phylogenetic analyses using Maximum Parsimony, Maximum Likelihood and Bayesian analyses, based on sequences of the nuclear ribosomal ITS and of two plastid markers (partial rbcL and matK) and Maximum Parsimony for reconstructing the carpological character states at ancestral nodes. Achene characters, especially related to pericarp anatomy, such as general topography of the tissue types, disposition of the mechanical tissue and direction of its fibres, presence or absence of air cavities, provide, in certain cases, support for the phylogenetic lineages revealed. Confirming the polyphyly of Scorzonera, we propose a revised classification of the subtribe, accepting the genera Scorzonera (including four major clades: Scorzonera s. str., S. purpurea, S. albicaulis and Podospermum), Gelasia, Lipschitzia gen. nov. (for the Scorzonera divaricata clade), Pseudopodospermum, Pterachaenia (also including Scorzonera codringtonii), Ramaliella gen. nov. (for the S. polyclada clade) and Takhtajaniantha. A key to the revised genera and a characterisation of the genera and major clades are provided.

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Research Article Wed, 8 Jan 2020 11:18:42 +0200
Zahora, a new monotypic genus from tribe Brassiceae (Brassicaceae) endemic to the Moroccan Sahara https://phytokeys.pensoft.net/article/46946/ PhytoKeys 135: 119-131

DOI: 10.3897/phytokeys.135.46946

Authors: Marcus A. Koch, Claude Lemmel

Abstract: Zahora ait-atta Lemmel & M.Koch, a new species from the Moroccan Sahara, is described and documented here and constitutes a monotypic new genus. The new taxon belongs to the tribe Brassiceae (Brassicaceae), and cytogenetic and phylogenetic analyses reveal that this diploid species has a remote status of Miocene origin in the northwestern Sahara Desert. We examined the morphological differences between morphologically related genera and provide photographs of the new species. The new genus may play a key role in future Brassica-Raphanus crop research since it is placed phylogenetically at the base of a generically highly diverse clade including Raphanus sativus, and it shows affinities to various Brassica species.

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Research Article Thu, 5 Dec 2019 11:38:00 +0200
Monograph of Coccinia (Cucurbitaceae) https://phytokeys.pensoft.net/article/5797/ PhytoKeys 54: 1-166

DOI: 10.3897/phytokeys.54.3285

Authors: Norbert Holstein

Abstract: This monograph deals with all 95 names described in the Cucurbitaceae genus Coccinia and recognizes 25 species. Taxonomic novelties are Coccinia adoensis var. aurantiaca (C.Jeffrey) Holstein, stat. nov., C. sessilifolia var. variifolia (A.Meeuse) Holstein, stat. nov., and C. adoensis var. jeffreyana Holstein, var. nov. For the 25 species 3157 collections were examined, of which 2024 were georeferenced to produce distribution maps. All species are distributed in sub-Saharan Africa with one species, C. grandis, extending from Senegal in West Africa east to Indonesia and being naturalized on Pacific Islands, in Australia, the Caribbean, and South America. Coccinia species are dioecious creepers or climbers with simple or bifid tendrils that occupy a range of habitats from arid scrubland, woodlands to lowland rainforest and mist forest. The corolla of Coccinia species is sympetalous, usually pale yellow to orange, and 1 to 4.5 cm long. Pollination is by bees foraging for pollen or nectar. After pollination, the developing ovary often exhibits longitudinal mottling, which usually disappears during maturation. All species produce berries with a pericarp in reddish colors (orange-red through to scarlet red), hence the generic name. The globose to cylindrical fruits contain numerous grayish-beige flat to lenticular seeds. Chromosome numbers are 2n = 20, 24, and 22 + XX/XY. Many Coccinia species are used for food, either as roasted tubers, greens as spinach, or the fruits as vegetables. Medicinal value is established in C. grandis, of which leaves and sap are used against diabetes.

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Monograph Mon, 3 Aug 2015 00:00:00 +0300
Pantoporate pollen in the Asteraceae (Vernonieae) https://phytokeys.pensoft.net/article/1534/ PhytoKeys 38: 1-13

DOI: 10.3897/phytokeys.38.7495

Authors: Harold Robinson, John Skvarla

Abstract: Pantoporate pollen, which occurs sporadically in the Monocots and Dicots, has now been found in Asteraceae in two apparently related genera of the tribe Vernonieae, Polydora Fenzl and Oocephala H.Rob. Disposition of pores in Polydora seems more asymmetric than in Oocephala. Based on the known relationships within the Vernonieae, some conjectures are made regarding development of the pantoporate condition in the group.

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Research Article Mon, 19 May 2014 00:00:00 +0300
Taxonomy of Atlantic Central African orchids 2. A second species of the rare genus Distylodon (Orchidaceae, Angraecinae) collected in Cameroon https://phytokeys.pensoft.net/article/1523/ PhytoKeys 36: 27-34

DOI: 10.3897/phytokeys.36.7225

Authors: Vincent Droissart, Phillip J. Cribb, Murielle Simo-Droissart, Tariq Stévart

Abstract: While conducting field inventories in South Cameroon, we collected two specimens of a new species that we considered to belong to the genus Angraecopsis. Afterwards, a careful examination of specimens housed at main herbaria, along with the nomenclatural types, allows us to place it in Distylodon, a monotypic genus previously known from East Africa. Distylodon sonkeanum Droissart, Stévart & P.J.Cribb, sp. nov. was collected in the lowland coastal forest of Atlantic Central Africa. It is known from a single locality in the surroundings of the Campo-Ma’an National Park. The species differs from D. comptum, by its several-flowered inflorescences, longer leaves and spur, and shorter pedicel and ovary. The species appears to be rare and is assessed as Critically Endangered [CR B2ab(iii)] according to IUCN Red List Categories and Criteria. New field investigations are required to attempt to find it in the low-elevation parts of the Campo-Ma’an National Park in Cameroon.

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Research Article Wed, 9 Apr 2014 00:00:00 +0300
Herbarium of Vascular Plants Collection of the University of Extremadura (Spain) https://phytokeys.pensoft.net/article/1480/ PhytoKeys 25: 1-13

DOI: 10.3897/phytokeys.25.5341

Authors: Marta Espinosa, Josefa López

Abstract: The herbarium of University of Extremadura (UNEX Herbarium) is formed by 36451 specimens of vascular plants whose main origin is the autonomous region of Extremadura (Spain) and Portugal, although it also contains a smaller number of specimens from different places, including the rest of peninsular Spain, the Baleares Islands, the Macaronesian region (Canary Islands, Madeira and Azores), northwest of Africa (Morocco) and Brazil. 98% of the total records are georeferenced.It is an active collection in continuous growth. Its data can be accessed through the GBIF data portal at http://data.gbif.org/datasets/resource/255 and http://www.eweb.unex.es/eweb/botanica/herbario/. This paper describes the specimen associated data set of the UNEX Herbarium, with an objective to disseminate the data contained in a data set with potential users, and promote the multiple uses of the data.

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Data Paper Wed, 19 Jun 2013 00:00:00 +0300