N. Vietnam, Thai Nguyen prov., Dong Hy distr., Tan Long municipality, vicinities of Mo Ba village (21°46′26′'N, 105°52′25′'E). Primary wet broad-leaved evergreen closed forest (with Burettiodendron hsienmu as a main dominant) on remnant highly eroded limestone ridge at elev. 400-550 m a.s.l. Lithophytic herb in crevices of vertical cliffs adpressed to the rocks. Leaves deep green, with irregular palmate stripes and spots above; light green, with irregular purple-violet stripes below. Common.