Quang Binh Prov., Minh Hoa Distr., Dan Hoa Municipality, to the EEN of Bai Dinh village around point 17°46′34”N 105°48′56”E.
Primary broad-leaved closed wet forest on very steep rocky slopes and cliffs of low remnant mountains composed with highly eroded solid marble-like limestone at elevation about 700-800 m a.s.l.
Lithophytic herb to 0.5 m tall on wet rocks along shady rocky stream valley. Flowers whitish. Locally very common.
HAL 12548 11 February 2009 Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, L.T.Son.