Quang Binh Prov., Minh Hoa Distr., Dan Hoa Municipality, Giang Man Ridge (Vietnam-Laos border) near Cha Lo Vietnam-Lao border gate around point 17°41′50”N 105°45′54”E.
Primary evergreen broad-leaved wet forest on very steep mountain slopes and cliffs composed with shale and sandstone at elevation about 800-900 m a.s.l.
Terrestrial herb on very steep shady rocky slope. Flower buds green with dark violet tint. Not common.
HAL 12253 5 February 2009 Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, L.T.Son.