Nujiangia （Orchidaceae： Orchideae）： A new genus from the Himalayas

The phylogenetic positions of the enigmatic ＂wildcard＂ taxon, Habenaria griffithii, were inferred from molecular data and morphological evidence. Morphologically, H. griffithii is quite ＂isolated＂ in Habenaria; instead, it is close to Gennaria, Diphylax, Peristylus, and Platanthera. It can be distin...

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Published in:植物分类学报：英文版 2012, Vol.50 (1), p.64-71
Main Author: Xiao-Hua JIN De-Zhu LI Xiao-Guo XIANG Yang-Jun LAI Xiao-Chun SHI
Format: Article
Language:English
Subjects:
rbcL基因
tK基因
兰科
内转录间隔区
分子数据
分类处理
喜马拉雅山
新属
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Summary:The phylogenetic positions of the enigmatic ＂wildcard＂ taxon, Habenaria griffithii, were inferred from molecular data and morphological evidence. Morphologically, H. griffithii is quite ＂isolated＂ in Habenaria; instead, it is close to Gennaria, Diphylax, Peristylus, and Platanthera. It can be distinguished from these four genera by its slender staminodes conspicuously longer than the anther, rostellum having two relatively long arms, lip and lateral sepals connate in the basal part, and a transverse cushion-shaped stigma. An analysis of combined plastid and nuclear data （rbcL, matK, and internal transcribed spacer） using Bayesian and parsimony methods revealed that H, griffithii is closest to Gennaria, a monotypic genus restricted to the western Mediterranean and Canary Islands. On this basis, a new genus, Nujiangia, is tentatively proposed to accommodate this taxon. In addition to the taxonomic treatment of this genus, the delimitation of many related genera in Orchideae is discussed.
ISSN:1674-4918
1759-6831