FLORA OF VIETNAM Orchidaceae Dendrobium hercoglossum Rchb.f.
Northern Vietnam, Ninh Binh Prov., Nho Quan Distr., Cuc Phuong Municipality, Cuc Phuong National Park, about 0.5 km W from Bong locality, 20°21′01′'N, 105°35′38′'E. Primary closed evergreen seasonal broad-leaved lowland forest on tops of limestone hills at elev. about 500 m a.s.l. Epiphyte on high tree. Flowers: tepals light violet, lip white with violet tint and light violet apex, column at the base green, anther deep violet. Not rare.