Gnetum chinense Y. Yang, Bing Liu & S.Z. Zhang, 2020
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publication ID |
https://dx.doi.org/10.3897/phytokeys.148.48510 |
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persistent identifier |
https://treatment.plazi.org/id/77DD1B45-1A13-5730-AD08-D0752659A11F |
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treatment provided by |
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scientific name |
Gnetum chinense Y. Yang, Bing Liu & S.Z. Zhang |
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sp. nov. |
Gnetum chinense Y. Yang, Bing Liu & S.Z. Zhang sp. nov. Figs 3 View Figure 3 , 4 View Figure 4
Type.
China. Yunnan: Cang-yuan County, on the way from Ban-hong to Ban-lao Prefecture, forest margin, male cones, March 31st, 2015, B. Liu, Y. Yang & T.W. Xiao 2627 (PE, holotype).
Diagnosis.
This species is similar to G. montanum in its oblong elliptic leaves and subsessile chlamydosperm, but differs from the latter by its shorter male cones (1-1.5 cm long in the new species vs. 2-3 cm in G. montanum ) having fewer involucral collars (7-10 in the new species vs. 13-18 in G. montanum ), nearly sessile or extremely shortly stiped chlamydosperms (vs. markedly stiped, stipes 3-5 mm long in G. montanum ).
Description.
Lianas; twigs terete, dichasially branched having swollen nodes. Leaves opposite (Fig. 4a View Figure 4 ), oblong to elliptic, 11-16 cm long, 4-8 cm wide, base rotund to acute, apex acute to acuminate, pinnately veined, midvein impressed adaxially and elevated abaxially, lateral veins 6-8 (Fig. 4a View Figure 4 ), more or less elevated on both sides, petioles 1-1.2 cm long, grooved adaxially. Male reproductive shoots terminal, dichasial, branched once or twice (Fig. 4a View Figure 4 ). Male cones pedunculate, peduncles 2-10 mm long; cylindric, ca. 10-15 mm long, 4 mm in diam., involucral collars 8-10 (Fig. 4b View Figure 4 ). Chlamydosperms ellipsoid to subglobose, ca. 2.2 cm long, 1.4 cm in diam., apex obtuse, base contracted into an extremely short stalk or subsessile, green when young, and orange when mature (Fig. 4c View Figure 4 ).
Distribution.
In Yunnan and Guizhou provinces of China (Fig. 3 View Figure 3 ).
Habitats.
In evergreen tropical and subtropical forests.
Etymology.
The specific epithet ' chinense ' is derived from China.
Phenology.
Blooming male cones and mature chlamydosperms were found in late May and early November, respectively.
Conservation.
Gnetum chinense is common in evergreen forests in Yunnan and Guizhou. We consider this species to be of Least Concern (LC) under the IUCN Red List Categories and Criteria ver. 3.1 second edition ( IUCN 2012).
Specimens examined.
China. Yunnan: Lan-cang Lahuzu Autonomous County, from Shang-yun to Xi-meng, Apr. 2, 2015, B. Liu, Y. Yang & T.W. Xiao 2675 (PE); Jiang-cheng County, Qu-shui Prefecture, Apr. 18, 2015, B. Liu 3045 (PE); Ma-li-po County, March 15-17, 2015, T. Wan MLP001, MLP002, MLP003, MLP 005 (PE); Ma-li-po County, Xia-jin-chang Prefecture, Li-jia-wan, May 27, 2011, B. Liu 1360 (PE); Ma-li-po County, Xia-jin-chang Prefecture, Li-jia-wan, Sept. 24, 2011, B. Liu 1441 (PE); Ma-li-po County, Xia-jin-chang Prefecture, Li-jia-wan, Nov. 2, 2012, B. Liu 1725 (PE). Guizhou: unknown collection date, C.Y. Deng CYD12466 (PE).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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