Scientific name: Peristylus prainii King & Pantling
English name:
Vietnamese name: Chu thư prain
Other name: Habenaria prainii Hook. f.; Yunorchis pingbianensis Liu, Zhang & Li; Yoania pingbianensis (Z.J.Liu, G.Q.Zhang & M.H.Li) Yukawa & Freudenstein;

The  flowers  are  described  as  “pale  brownish  white”,  and  on  the  same  sheet  is  a  sketch  by  Joseph Hooker  that  shows  a  callus  on  the  lip. The scales on the rhizome can be more or  less  densely  arranged, and they  do  not  present  a  reliable  difference. The  length  and  branching  density  of  the  rhizome  are  probably  subject  to  variation  as  well,  due  to  soil  conditions  and other environmental parameters, but not enough material is available to assess variability of this part of the plant.

Distribution:

Northeastern India:Sikkim, Nagaland

China: Yunnan

Vietnam: Ha Giang Province: Yen Minh district, Du Gia commune and Quan Ba district, Tung Vai (Bat Dai Son)