N.Vietnam, Bac Kan Prov., Ba Be Distr., Nam Mau Municipality, Ba Be National Park around point 22o23′08′'N 105o36′33′'E.
Selectly logged primary evergreen wet closed broad-leaved forest on steep slopes composed with crystalline highly eroded marble-like limestone at elevation about 250 m a.s.l. along deep stream canyon.
Lithophyte and terrestrial herb in shady place. Common.
HLF 636 23 Dec. 2002.
Coll. J.Regalado, Nguyen Tien Hiep, L.Averyanov, Do Hoang Chung, To Van Thao, Vu Hong Van, Nguyen Tien Vinh, Mai Van Xinh. Grant from Henry Luce Foundation.