FLORA OF VIETNAM
Orchidaceae Juss.
Didymoplexiella siamensis (Rolfe) Seidenf.

N. Vietnam, Tuyen Quang prov., Na Hang distr., Xuan Tam municipality, near Ban Cai village (22°29′18′'N, 105°19′47′'E). Primary broad-leaved evergreen dry forest on very steep slopes of highly eroded remnant limestone ridge at elev. 450-500 m a.s.l. Terrestrial tuberiferous saprophyte in dry steep slope with bamboo. Flowers with strong, very pleasant fragrance, tepals light purple-violet, column white. Rare.
HAL 218 22 March 2001
Collectors: P.K.Loc, N.X.Tam, L. Averyanov.