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| Disporum nanchuanense X.X.Zhu & S.R.Yi
in Zhu, Liao & Yi, 2019.
Revealing of the Plant Diversity in China’s Biodiversity Hotspots. PhytoKeys. 130
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Abstract
Disporum nanchuanense (Colchicaceae), a new species from Jinfo Mountain National Nature Reserve, Nanchuan District, Chongqing, China, is described and illustrated. It is similar to D. longistylum and D. megalanthum, but differs from the former in its stem branched type, tepals colour and size, stamens and pistil size; and it differs from the latter in inflorescence position, tepals shape, stamens position, pistil position and size. Meanwhile, the new taxon is assessed as Vulnerable (VU D2), according to the IUCN Red List criteria. Furthermore, an identification key to all Chinese species of Disporum is provided.
Keywords: Jinfo Mountain, Liliaceae, morphology, taxonomy
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| Figure 2. Disporum nanchuanense X.X.Zhu & S.R.Yi. A Plant B–C Leaves D–E Inflorescences F Roots. Photographed by Xinxin Zhu. |
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| Figure 1. Disporum nanchuanense X.X.Zhu & S.R.Yi. A Plant B Leaf C Tepal in frontal view D Tepal in back view E Stamen F Pistil.
Illustration by Huixia Dong.
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Disporum nanchuanense X.X.Zhu & S.R.Yi, sp. nov.
Diagnosis: Disporum nanchuanense X.X.Zhu & S.R.Yi is similar to D. longistylum (Léveillé & Vaniot) Hara and D. megalanthum Wang & Tang, but it differs from D. longistylum in its stem which is usually simple, rarely branched, tepals white with purple, apex obtuse, 22–25 × 2.8–4 mm, filaments 20–24 mm long, anthers 5.2–5.6 mm long and ovary ca. 4.6 mm long, style 27–29 mm long; and it differs from D. megalanthum in its inflorescences terminal, petiole 3–13 mm long, tepals white with purple, oblanceolate, apex obtuse, stamens distinctly exserted and ovary ca. 4.6 mm long, style 27–29 mm long, distinctly exserted. Detailed morphological comparison is shown in Table 1 and Figure 4.
Etymology: The specific epithet refers to the type locality, Nanchuan District, Chongqing, China. The Chinese name is given as “南川万寿竹”.
Distribution and habitat: Disporum nanchuanense is presently known only from the type locality in Jinfo Mountain National Nature Reserve, Nanchuan District, Chongqing. It grows under conifer-broadleaved forest at 1386–1411 m, together with Arisaema bockii Engl. (Araceae), Cardamine hygrophila T.Y.Cheo & R.C.Fang (Brassicaceae), Cephalotaxus fortunei Hook. (Cephalotaxaceae), Liriodendron chinense (Hemsl.) Sargent. (Magnoliaceae), Pinus massoniana Lamb. (Pinaceae), Rhododendron coeloneurum Diels (Ericaceae), Sanicula orthacantha S.Moore (Apiaceae) etc.
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| Figure 4. A-C: Disporum nanchuanense X.X.Zhu & S.R.Yi. A Plant B Inflorescence C Flower dissection D-F: D. longistylum (Lévl. & Vant.) Hara D Plant E Inflorescence F Flower dissection G-I: D. megalanthum Wang & Tang G Plant H Inflorescence I Flower dissection. A-H: Photographed by Xinxin Zhu; I: Photographed by Renbin Zhu. |
Xinxin Zhu, Shuai Liao and Sirong Yi. 2019. Disporum nanchuanense (Colchicaceae), A New Species from Chongqing, China. In: Jie Cai, Wen-Bin Yu, Ting Zhang, De-Zhu Li (Eds) Revealing of the Plant Diversity in China’s Biodiversity Hotspots. PhytoKeys. 130: 49-57. DOI: 10.3897/phytokeys.130.34005
