Northern Vietnam, Ninh Binh Prov., Nho Quan Distr., Cuc Phuong Municipality, Cuc Phuong National Park, arouund point 20°14′52′'N, 105°40′35′'. Prinary evergreen seasonal broad-leaved lowland wet forest on walley between limestone hills at elev. about 250 m a.s.l. Lithophytic herb on shady rocky slope. Leaves uniform deep green abowe, brown-purple beneath. Locally very common.