FLORA OF LAOS
Orchidaceae
Bulbophyllum nigripetalum Rolfe

Houphan Prov., Hem Distr., Na Puok village, Pu Tham Nhon mountain around point 20°10′00.0′'N 103°24′37.0′'E.

Primary and secondary broad-leaved evergreen dry forest on very steep rocky mountain slopes composed by solid marble-like highly eroded limestone at elev. 1050-1150 m a.s.l.

Epiphyte on mossy tree in shady place near mountain top. Flowers entirely dark dirty purple to almost black. Common.

LA-VN 1321b 11 April 2015 (alcohol fixed flowers and living plant)
Coll.: N.T.Hiep, L.Averyanov, N.S.Khang, N.Q.Hieu, T.Maisak, Pheng Phengsintham.