L.Averyanov, T.H.Nguyen, V.T.Pham & T.V.Nguyen HAL 4979
Locality
N Vietnam, Bac Kan Prov., Na Ri Distr., Liem Thuy Municipality, village Lung Vai, around the point 21°57'18 N, 106°06'12 E, at elev. of 500-700 m a.s.l. Primary broad-leaved evergreen closed wet forest on very steep slopes and cliffs of rocky ridges and mesae composed of white solid marble-like crystalline limestone. Terrestrial and lithophytic herb on very steep rocky slope.