N.Vietnam, Bac Kan Prov., Na Ri Distr., Liem Thuy Municipality, Na Bo. village, around point 21°56'44"N, 106°05'09"E, at elevation 300-600. m a.s.l. Primary selectly logged broad-leaved evergreen forest on very steep. slopes and cliffs of rocky ridge composed with white solid marble-like. crystalline limestone. Creeping epiphyte and occasionally lithophyte. Leaves deep violet. below. Common. No HAL 5417 29 May 2004.