Vientiane prov., Vang Vieng distr., Oa Hom village, around point 19°05'57.0''N 102°23'19.9''E.
Secondary broad-leaved evergreen and semideciduous dry forest with on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 650-750 m a.s.l. Creeping herb in shady places on rocky steep slope. Leaves dark green, spathe white. Locally common.