Quang Binh Prov., Minh Hoa Distr., Dan Hoa Municipality, Bai Dinh village around point 17°44′04”N 105°49′14”E.
Remnants of primary evergreen broad-leaved forest on very steep slopes and on tops of remnant hills composed with highly eroded marble-like solid limestone at elevation about 400-500 m a.s.l.
Terrestrial herb on very steep shady slope with bamboo near to rocky hill top. Flower buds olive-yellowish. Not common.
HAL 12477 8 February 2009 Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, L.T.Son.