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Research Article
Big fruits with tiny tepals: An unusual new species of Lauraceae from southwestern China
expand article infoZhi Yang, Wei-Yin Jin§, Bing Liu, David Kay Ferguson|, Yong Yang
‡ Institute of Botany, the Chinese Academy of Sciences, Beijing, China
§ Tonghua Normal University, Tonghua, China
| University of Vienna, Vienna, Austria
¶ Nanjing Forestry University, Nanjing, China
Open Access

Abstract

We collected an unusual new plant of Phoebe (Lauraceae) from southeastern Yunnan, China, which possesses more or less oblong leaves, paniculate inflorescences with strictly opposite lateral cymes, trimerous flowers with 4-locular stamens, and large fruits with tiny, equal, persistent tepals. Our molecular phylogenetic study based on nrITS, LEAFY and plastid matK sequences suggests that this species belongs to a clade of Phoebe including P. puwenensis, P. megacalyx, and P. macrocarpa. However, this species differs from the latter three species by subglabrous twigs, leaves and inflorescences (vs. pubescent twigs, leaves and inflorescences in the latter three species), larger fruits (5–8 cm long vs. 1–4 cm long in the latter three species), and smaller tepals (1–2.5 mm long vs. 5–15 mm long in the latter two species). As a result, Phoebe jinpingensis sp. nov. is described and illustrated here as new to science.

Keywords

Lauraceae, morphology, new species, Phoebe, phylogeny, taxonomy

Introduction

The Lauraceae are woody plants, except for the hemiparasitic climber genus Cassytha L. (Linnaeus 1753), and have more than 3,000 species mainly distributed in tropical regions (Rohwer 1993). This family is notorious for its complicated taxonomy. Many Lauraceae are large trees, which makes it difficult to collect specimens in the field. Good quality specimens are rarely represented in herbaria, many species being known from only one or a few imperfect specimens lacking floral or fruiting characters. The integration of morphological and molecular evidence represents a promising way to better understand the diversity of the tropical family Lauraceae.

Phoebe Nees (Nees von Esenbeck 1836) contains ca. 100 species that are distributed in tropical and subtropical Asia (van der Werff 2001; Wei and van der Werff 2008). Morphologically, Phoebe is well-defined and differs markedly from other Asian genera of the Persea group by the persistent and appressed tepals at the base of fruits (vs. deciduous or persistent and spreading tepals), e.g. Alseodaphne Nees (Wallich 1831), Alseodaphnopsis H.W.Li & J.Li (Mo et al. 2017), Dehaasia Blume (Blume 1837), Machilus Nees (Wallich 1831), Nothaphoebe Blume (Blume 1851).

Recently, we collected both flower and fruit materials of one notable tree species while conducting field investigations in southeastern Yunnan, China. Further morphological and molecular phylogenetic studies indicate that this species is a new species of Phoebe. We thus describe it here as new to science.

Material and methods

Morphology and Anatomy

We conducted field collections and morphological observations, obtained voucher specimens, preserved flowers in FAA, and dried leaf materials with silica gel. Photographs of vegetative and reproductive characters were taken with a Nikon camera (D700). The preserved flowers were dissected and observed, and photographs were taken under a stereo microscope (Leica S8APO).

Phylogeny

To determine the systematic position of our new species, we conducted a phylogenetic study using nrITS, LEAFY and plastid matK sequences. This phylogeny included 40 species from five genera of the Persea group (Alseodaphne, Alseodaphnopsis, Dehaasia, Machilus and Phoebe). Litsea acuminata (Blume) Sa. Kurata (Kurata 1968) and Litsea akoensis Hayata (Hayata 1911) were selected as the outgroup. Markers used in this phylogenetic study were either sequenced in this study or obtained from the GenBank (https://www.ncbi.nlm.nih.gov/genbank/). Vouchers and accession numbers of sequences are listed in Table 1.

Table 1.

Sequences obtained in this study and their vouchers. All voucher specimens are deposited in PE.

Species ITS LEAFY matK Voucher specimen Locality
Alseodaphne huanglianshanensis H.W.Li & Y.M.Shui MW826229 MW849576 MW849603 Bing Liu 2447 China, Yunnan
Alseodaphnopsis andersonii (King ex Hook.f.) H.W.Li & J.Li MW826228 MW849575 MW849602 Bing Liu 1584 China, Yunnan
Alseodaphnopsis hokouensis (H.W.Li) H.W.Li & J.Li MW826237 MW849583 MW849610 Bing Liu 2358 China, Yunnan
Alseodaphnopsis petiolaris (Meisn.) H.W.Li & J.Li MW826234 MW849580 MW849607 Bing Liu 1266 China, Yunnan
Alseodaphnopsis sichourensis (H.W.Li) H.W.Li & J.Li MW826235 MW849581 MW849608 Bing Liu 1980 China, Yunnan
Alseodaphnopsis ximengensis H.W.Li & J.Li MW826236 MW849582 MW849609 Bing Liu 4726 China, Yunnan
Dehaasia incrassata (Jack) Kosterm. MW826238 MW849585 MW849612 X.H.Jin IN004 Indonesia.
Litsea acuminata (Blume) Kurata MW826239 MW849586 MW849613 Y.Yang, T.T.Sun & W.Y.Jin 2016110811 China, Taiwan
Litsea akoensis Hayata MW826240 MW849587 MW849614 Y.Yang, T.T.Sun & W.Y.Jin 2016110810 China, Taiwan
Machilus bonii Lec. MW826241 MW849588 MW849615 Bing Liu 2133 China, Yunnan
Machilus breviflora (Benth.) Hemsl. MW826242 MW849589 MW849616 Bing Liu 1827 China, Guangdong
Machilus melanophylla H.W.Li MW826243 MW849590 MW849617 Bing Liu 1950 China, Yunnan
Machilus robusta W.W.Sm. MW826244 MW849591 MW849618 Bing Liu 1524 China, Yunnan
Phoebe angustifolia Meisn. MW826246 MW849620 Bing Liu 1490 China, Yunnan
Phoebe cavaleriei (H.Lév.) Y.Yang & Bing Liu MW826245 MW849619 Bing Liu 2215 China, Yunnan
Phoebe chekiangensis C.B.Shang MW826247 MW849592 MW849621 Bing Liu 2232 China, Hubei
Phoebe formosana (Hayata) Hayata MW826248 MW849593 MW849622 Y.Yang, T.T.Sun & W.Y.Jin 2016110836 China, Taiwan
Phoebe jinpingensis Liu B. 1477 MW826231 MW849584 MW849611 Bing Liu 1477 China, Yunnan
Phoebe jinpingensis Liu B. 2050 MW826232 MW849578 MW849605 Bing Liu 2050 China, Yunnan
Phoebe jinpingensis Liu B. 2052 MW826233 MW849579 MW849606 Bing Liu 2052 China, Yunnan
Phoebe jinpingensis Liu B. 2417 MW826230 MW849577 MW849604 Bing Liu 2417 China, Yunnan
Phoebe lanceolata (Wall. ex Nees) Nees MW826249 MW849594 MW849623 Bing Liu 2532 China, Yunnan
Phoebe macrocarpa C.Y.Wu MW826250 MW849595 MW849624 Bing Liu 1239 China, Yunnan
Phoebe megacalyx H.W.Li MW826251 MW849596 MW849625 Bing Liu 1988 China, Yunnan
Phoebe nanmu (Oliv.) Gamble MW826252 MW849597 MW849626 Bing Liu 2227 China, Yunnan
Phoebe neurantha var. brevifolia H.W.Li MW826253 MW849598 MW849627 Bing Liu 2270 China, Yunnan
Phoebe neurantha (Hemsl.) Gamble MW826254 MW849599 MW849628 Bing Liu 1570 China, Yunnan
Phoebe puwenensis W.C.Cheng MW826255 MW849600 MW849629 Bing Liu 2242 China, Yunnan
Phoebe sheareri (Hemsl.) Gamble MW826256 MW849601 MW849630 Bing Liu 2224 China, Hubei
Phoebe tavoyana (Meisn.) Hook.f. MW826257 MW849631 Bing Liu 1822 China, Hainan

Total DNA was extracted from silica-gel-dried leaves using Tiangen Plant Genomic DNA kits. To amplify the nrITS, LEAFY and plastid matK fragments, we followed Li et al. (2004, 2011b) and Sang et al. (1997) in the primers and the PCR amplification.

Sequences were edited with Sequencher 4.1.4 (Gene Codes Corporation, Ann Arbor, Michigan, USA), aligned using MAFFT 7 (Katoh and Standley 2013), and then manually adjusted using BioEdit 7.2.5 (Hall 1999). MEGA-X was used to compute variable and parsimony-informative sites (Kumar et al. 2018). Phylogenetic analyses were based on concatenated sequences in Phylosuite v1.2.2 (Zhang et al. 2020). The best-fit nucleotide substitution model for each sequence was determined by Modelfinder (Kalyaanamoorthy et al. 2017) in Phylosuite v1.2.2 based on BIC (Schwarz and Gideon 1978). Bayesian inferences (BI) based on the concatenated sequences were carried out with MrBayes (Ronquist et al. 2012) in Phylosuite v1.2.2 with the following designations: number of generations 2,000,000, sampling frequency 1000; a relative burnin of 25.0% for diagnostics. Maximum likelihood (ML) analyses were run with the IQtree (Nguyen et al. 2014) in Phylosuite v1.2.2 with 1000 bootstrap replicates.

Figure treatments

The line drawing was done manually with a black ink pen. Illustrations and photos showing morphological characters were edited and merged in Adobe Photoshop CS2 ver. 9.0. Phylogenetic trees were browsed and adjusted in FigTree ver. 1.4.0 (Rambaut 2012) and then improved with Adobe Illustrator CS ver. 11.0.0. A distribution map was generated with ArcGis ver. 10.0 (ESRI, Redlands, CA, USA; http://www.esri.com).

Red list assessment

Extinction risk was assessed using IUCN categories and criteria (IUCN 2012). Population data and area of occupancy were obtained/estimated according to our field investigations.

Results

Phoebe jinpingensis Bing Liu, Y.Yang, W.Y.Jin & Zhi Yang, sp. nov.

Figs 1, 2, 3

Type

China. Yunnan Province: Jinping County, Mengla, Tuomazhai, 22°37'N, 103°01'E, elev. 956 m, 8 Apr 2014, B.Liu, Y.Yang, Q.W.Lin, L.Jiang & X.J.Li 2050 (holotype: PE!; isotypes: PE!).

Diagnosis

This species is similar to P. macrocarpa C.Y.Wu (Wu and Wang 1957) and P. megacalyx H.W.Li (Lee et al. 1979) in the large fruits over 3 cm in diam., but differs from the latter two species by the subglabrous leaves being more or less oblong-elliptic and the larger fruits having smaller tepals.

Description

Trees (Fig. 1A), up to 15 m tall, to 40 cm in DBH (diameter at breast height). Bark yellowish gray. Branchlets purplish, slender, longitudinally ridged, subglabrous. Leaves alternate, usually clustered at the apex of branchlets, thinly coriaceous to chartaceous, subglabrous, oblong to oblanceolate (Fig. 1B), 15–25 × 5–8 cm, apex acute to slightly acuminate, base acute, midvein impressed adaxially, and prominently elevated abaxially, lateral (secondary) veins 7–10 pairs, immersed adaxially and elevated abaxially, transverse minor (tertiary) veinlets connecting lateral veins visible; petioles 1.2–4 cm, subglabrous. Panicles slender, 4–9 cm long, subglabrous. Flowers yellowish (Fig. 1C). Tepals subequal, 2–2.4 mm long. Fertile stamens in three whorls; filaments of the first and second whorls 1–2 mm; anthers 4-locular, locules arranged in trapezoid shape; each filament of the 3rd staminal whorl possessing two yellow cordate glands at its base. Staminodes sagittate. Fruits ellipsoid to obovoid, avocado-shaped, 5–8 cm long, and 3.5–5.2 cm in diam. (Fig. 1D–F); tepals persistent, equal, triangular to ovate, tiny, 2–2.5 mm long, clasping the fruit base (Fig. 1F), concealed and inconspicuous when fruit becoming swollen (Fig. 1E). Fruit peduncles not thickened.

Figure 1. 

Morphology of Phoebe jinpingensis sp. nov. A habit of the tree B flowering branches C portion of a branch bearing inflorescences D fruiting branches E two fruits displaying swollen base and inconspicuous tepals F a fruit displaying the tiny tepals at the base.

Figure 2. 

Anatomy of a flower of Phoebe jinpingensis sp. nov. showing morphology of stamens, staminodes, and pistil A stamens of the first staminal whorl, adaxial side B stamen of the first staminal whorl, abaxial side C stamen of the second staminal whorl, adaxial side D stamen of the second staminal whorl, abaxial side E stamen of the third staminal whorl, adaxial side F stamen of the third staminal whorl, abaxial side G staminode of the fourth staminal whorl, adaxial side H staminode of the fourth staminal whorl, abaxial side I pistil.

Figure 3. 

Line-drawing showing details of Phoebe jinpingensis sp. nov. A a flowering branch B fruits C fertile stamens of the first staminal whorl, abaxial side D fertile stamens of the first staminal whorl, adaxial side E fertile stamen of the third staminal whorl with the two glands at the base of the filaments, adaxial side F fertile stamen of the third staminal whorl with the two glands at the base of the filaments, abaxial side G staminode of the fourth staminal whorl showing pubescence, abaxial side H staminode of the fourth staminal whorl showing pubescence, adaxial side I pistil, with obovoid pubescent ovary and linear style.

Distribution

So far, this species has only been found in southeastern Yunnan, China (Fig. 4).

Figure 4. 

A map showing the distribution of Phoebe jinpingensis sp. nov.

Habitat

This species occurs in montane evergreen forests at an altitudinal range of 900–980 m. It blooms in April, and the fruits mature from September to December.

Etymology

The specific epithet ‘jinpingensis’ refers to the type locality “Jinping County”.

Additional specimens examined

China. Yunnan Province: Jinping County, Mengla, Tuomazhai, 8 Apr 2014, fruit, B.Liu, Y.Yang, Q.W.Lin, L.Jiang & X.J.Li 2052 (PE!); Jinping County, Mengla, Tuomazhai, 9 Oct 2011, fruit, B.Liu 1477 (PE!); Jinping County, Mengla, Tuomazhai, 14 Sep 2014, fruit, B.Liu, Y.Song, H.Lai & X.Yao 2417 (PE!).

Conservation

There is only one population with 10 mature individuals occupying ca. 400 m2. Fewer than 10 juvenile individuals were found. All the individuals have not been protected in any nature reserve, and a rubber plantation exists nearby the population. Based on IUCN Red List Categories and Criteria (IUCN 2012), the new species is categorized as “Critically Endangered” (CR Blab (v); D).

Phylogeny

We finally obtained 30 sequences of nrITS, 27 sequences of LEAFY and 30 sequences of matK (Table 2). The aligned nrITS sequences had 745 nucleotides including 149 variable sites among which 98 sites are parsimony-informative. The aligned LEAF sequences consisted of 896 nucleotides including 158 variable sites and 57 parsimony-informative. The aligned matK sequences contained 763 nucleotides with 22 variable sites and 13 parsimony-informative sites. The concatenated matrix was 2404 nucleotides in length and included 329 variable sites and 168 parsimony-informative sites. The best-fit nucleotide substitution models for the three markers for both BI and ML analyses are listed in Table 3.

Table 2.

The best-fit nucleotide substitution model of the three markers for both BI and ML analyses.

Analysis nrITS LEAFY matK
BI HKY+F+I+G4 HKY+F+G4 HKY+F+I
ML HKY+F+G4 HKY+F+G4 HKY+F
Table 3.

Information of nrITS, LEAFY, matK and concatenated sequences.

Item nrITS LEAFY matK all
Sequence length (nt) 745 896 763 2404
Variable (polymorphic) sites (nt) 149 158 22 329
Parsimony informative sites (nt) 98 57 13 168

Our phylogenetic study gave rise to BI and ML trees showing similar topology (Figs 5, 6). The genus Phoebe constituted a clade with moderate to high support (BS: 75, PP: 0.91), the two clades within the genus were robustly supported (BS: 100 and PP: 1). Clade I consisted of P. puwenensis W.C.Cheng (Cheng et al. 1963), P. macrocarpa, P. megacalyx, and P. jinpingensis. The four samples of our new species fell within a robust clade (BS: 100, PP: 1). Clade II includes P. angustifolia Meisn. (Meissner 1864), P. cavaleriei (H.Lév.) Y.Yang & Bing Liu (Yang and Liu 2015), P. chekiangensis C.B.Shang (Shang 1974), P. formosana (Hayata) Hayata (Hayata 1915), P. lanceolata (Wall. ex Nees) Nees (Nees von Esenbeck 1836), P. nanmu (Oliv.) Gamble (Sargent 1914), P. neurantha (Hemsl.) Gamble (Sargent 1914), P. sheareri (Hemsl.) Gamble (Sargent 1914), and P. tavoyana (Meisn.) Hook.f. (Hooker 1886).

Figure 5. 

Maximum Likelihood tree based on nrITS, LEAFY and plastid matK indicating the phylogenetic position of Phoebe jinpingensis sp. nov. Bootstrap support values (>50%) are shown above the branches.

Figure 6. 

Bayesian tree based on nrITS, LEAFY and plastid matK showing phylogenetic position of Phoebe jinpingensis sp. nov. Bayesian posterior probabilities (>0.50) are indicated above the branches.

Machilus was monophyletic (BS: 100 and PP: 1). Alseodaphne huanglianshanensis H.W.Li & Y.M.Shui (Li and Shui 2004) and Dehaasia incrassata (Jack) Kosterm. (Kostermans 1952) were close to Machilus (BS: 59%, PP: 0.91), but relationships among them were not resolved. Alseodaphnopsis, a recently established genus, constituted a monophyletic group which received high support (BS: 84%, PP: 1). Relationships among Alseodaphnopsis, Phoebe, and Machilus-Dehaasia-Alseodaphne were ambiguous.

Discussion

Modern taxonomy is based on phylogeny. There is no phylogeny with full sampling of Phoebe, only a few molecular phylogenetic studies including partial sampling of the genus (Rohwer et al. 2009; Li et al. 2011a, b; Song et al. 2017). Frey (2015) stated that the genus Phoebe is polyphyletic but provided no evidence. Li et al. (2011a, b) reconstructed a phylogeny based on nrITS and nuclear LEAFY indicating that Phoebe as a monophyletic group receives low bootstrap value (<50%) but high posterior probability (Li et al. 2011a, b). Our new phylogenetic study using three markers reaches a similar conclusion. However, Song et al. (2017) reconstructed a phylogeny of Phoebe based on 15 highly variable regions of the chloroplast genome and found that the genus as a clade receives high support (BS: 100%; PP: 1.00). These phylogenetic studies consistently suggested that the traditional subdivision of the genus into two sections, i.e. sect. Phoebe and Caniflorae Meisn. (Meissner 1864), is unreasonable because some species of sect. Caniflorae are actually closer to species of sect. Phoebe. According to our phylogenetic study, the new species Phoebe jinpingensis belongs to the genus Phoebe, and falls within a robustly supported clade including P. macrocarpa, P. megacalyx, P. puwenensis, which were formerly ascribed to the sect. Caniflorae.

The genus Phoebe possesses persistent appressed tepals at the base of the fruits, whereas Alseodaphne and Alseodaphnopsis have fruits lacking persistent tepals (van der Werff 2001; Li et al. 2008; Mo et al. 2017). A few species formerly assigned to Phoebe with less indurate tepals slightly recurving at the apex and globose fruits were transferred to Machilus based on molecular phylogenetic studies (Li et al. 2011a). Traditional taxonomic studies have suggested that the genus Phoebe is characterized by fruits with persistent appressed tepals (van der Werff 2001; Li et al. 2008). Our new species, P. jinpingensis, clearly belongs to the genus Phoebe, because of its fruits having persistent and appressed tepals in fruits (Fig. 1E). Our phylogenetic study also confirmed that the new species belongs to Phoebe.

Phoebe jinpingensis is unusual in the genus Phoebe. First, the fruit is very large and avocado-shaped. Second, the tepals of P. jinpingensis are quite tiny (1–2.5 mm long) and concealed and not obvious in well-developed swollen fruits (Fig. 1E). Third, the leaf shape of Phoebe is usually oblanceolate, while our new species possesses oblong to oblanceolate leaves which is unusual in the genus and more similar to Alseodaphne/Alseodaphnopsis.

The genus Phoebe usually possesses small fruits ca. 1 cm, the largest fruits being seen in P. megacalyx (ca. 3.2 cm long) and P. macrocarpa (3.5–4.2 cm long) (Wei and van der Werff 2008). Our new species is most similar to P. megacalyx and P. macrocarpa in its large fruits, but differs from the latter two species by the subglabrous twigs, leaves and inflorescences (vs. pubescent or tomentose twigs, leaves, and inflorescences), the bigger fruits (5–8 cm long vs. 3–4 cm long in the latter two species), and the smaller tepals (1–2.5 mm long vs. >5 mm long in the latter two species). Phoebe puwenensis also belongs to the same clade as P. jinpingensis in our phylogenetic trees. Our new species differs from P. puwenensis in the subglabrous twigs and leaves (vs. tomentose twigs and leaves in the latter species) and the bigger fruits (5–8 cm long vs. 1–2 cm long in the latter species). For taxonomic purposes, we provide a new key to these closely related species of clade I of the genus Phoebe.

Key to species of clade I of the genus Phoebe

1 Leaves, inflorescences, and twigs subglabrous; fruits large, up to 8 cm long, having tiny tepals ca. 2–2.5 mm long P. jinpingensis
Leaves, inflorescences, and twigs usually tomentose or pubescent; fruits smaller, usually ca. 1–4 cm, possessing bigger tepals 5 mm or longer 2
2 Fruits 3–4 cm long 3
Fruits 1–2 cm long P. puwenensis
3 Leaves asymmetrical at the base; tepals woody, ca. 15 mm long P. megacalyx
Leaves symmetrical at the base; tepals coriaceous, 5–6 mm long P. macrocarpa

Acknowledgements

We thank Henk van der Werff of Missouri Botanical Garden and George Staples of Harvard University for their valuable suggestions and Y.F.Li for his kind help with the line-drawing. We are also grateful to L.Li, L.Assis and J.G.Rohwer for their constructive suggestions on the manuscript. This work was supported by the National Natural Science Foundation of China [31970205, 31470301, 31770211] and the Metasequoia funding of Nanjing Forestry University.

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Supplementary material

Supplementary material 1 

Figures S1–S8, Tables S1–S3

Zhi Yang, Wei-Yin Jin, Bing Liu, David Kay Ferguson, Yong Yang

Data type: Phylogenetic trees and tables

Explanation note: Figures S1–S8. Phylogenetic trees. Figures S1–S6. BI and ML trees of Asian species of the Persea group using single markers. Figures S7, S8. BI and ML trees of the Persea group using concatenated sequences of nrITS, LEAFY and matK. Table S1. Sequences obtained from NCBI for phylogeny of the Persea group. Table S2. Substitution models of nrITS, LEAFY and matK for phylogeny using separate markers. Table S3. A tabulated comparison of fruit size of Phoebe from China.

This dataset is made available under the Open Database License (http://opendatacommons.org/licenses/odbl/1.0/). The Open Database License (ODbL) is a license agreement intended to allow users to freely share, modify, and use this Dataset while maintaining this same freedom for others, provided that the original source and author(s) are credited.
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