Dien Bien Prov., Dien Bien Distr., Na U Municipality, Ca Hau village, around point 21°13’08”N 102°57’14”E. Selectly logged primary closed evergreen broad-leaved submontane forest on rocky crystalline marble-like rocky limestone at elevation 1000-1050 m a.s.l. Epiphyte and lithophyte along tops of ridge. Locally common. Flowers yellowish-white.