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.
Terrestrial fern on shady slopes. Very common. Usual co-dominant of herbaceous forest stratum,
HAL 12590 11 February 2009 Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, L.T.Son.