J Syst Evol ›› 2012, Vol. 50 ›› Issue (1): 64-71.DOI: 10.1111/j.1759-6831.2011.00167.x

• Research Articles • Previous Articles     Next Articles

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

1Xiao-Hua JIN* 2De-Zhu LI 1Xiao-Guo XIANG 1Yang-Jun LAI 3Xiao-Chun SHI   

  1. 1(Herbarium & State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China)
    2(Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Heilongtang, Kunming 650204, China)
    3(Administrative Bureau of Gaoligongshan National Natural Reserve, Baoshan, Yunnan 678000, China)
  • Received:2011-07-08 Published:2012-02-03

Abstract: 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.

Key words: Himalayas, Habenaria griffithii, new genus, Nujiangia, Orchidaceae