Quang Binh Prov., Minh Hoa Distr., Dan Hoa Municipality, Bai Dinh village around point 17°45′28”N 105°46′14”E.
Remnants of primary evergreen broad-leaved forest along rocky stream canyon composed with highly eroded marble-like solid limestone at elevation about 160-250 m a.s.l.
Lithophytic herb to 1 m tall on wet shady rocks. Flowers white. Locally common.
HAL 12307 6 February 2009 Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, L.T.Son.