Scientific name: Bulbophyllum nigripetalum Rolfe
English name:
Vietnamese name:
Other name:

Creeping epiphytic herb with rhizome (3)4-8(12) cm long, (1.5)2-2.3(3) mm in diam., pseudobulbs usually dense touching each other. Pseudobulbs ovoid or subglobular, shortly attenuate at apex, (0.5)0.6-1.2(1.4) cm tall and wide. Leaves shortly petiolate; petiole terete, (4)5-12(15) mm long, grooved adaxially; leaf blade oblong elliptic, (5)6-14(16) cm long, (0.6)8-12(16) mm wide, obtuse. Inflorescence glabrous, erect, lax, many-flowered secund raceme, (16)20 - 50(60) cm long, glabrous; peduncle (10)15-25(30) cm long, with 4-6 sterile, narrowly ovate bracts to 1 cm long; rachis (5)6-18(25) cm long. Floral bracts narrowly triangular, (1.2)1.5-2(2.5)mm long, 0.6-0.8 mm wide, acute. Flowers not widely opening, opening few in one tome. Pedicel and ovary glabrous, (3)3.5-4(4.5) mm long. Sepals (3.2)3.4-3.6(4) mm long, obtuse, ciliate along margin and pubescent adaxially, median sepal narrowly ovate, (0.9)1-1.2(1.4) mm wide, lateral sepals rectangular broadly ovate, (2)2.2-2.4(2.5) mm wide. Petals (1.4)1.5-1.6(1.8) mm long, 0.5-0.6 mm wide, spatulate, more or less gradually broadening from narrow base to obovate apical part, obtuse, densely hairy at apex. Lip recurved, obovoid, (2.5)2.6-2.8(3.2) long, (0.9)1-1.2(1.3) mm wide, rounded at apex, finely ciliate or velutinous, grooved in basal part. Column (0.8)1-1.2(1.3) mm long and wide, stigma protruding, with tooth slightly below; stelidia triangular, (0.3)0.4(0.5) mm long, acute; anther helmet shaped, 0.5-0.6 mm in diam., densely papillose.

Habitat, phenology and conservation status.

Short creeping or clustering branch epiphyte. Primary broad-leaved evergreen submontane forests. 1000–1800 m. Fl. November – December.

Very rare.

Tentatively estimated

IUCN Red List status - DD.

Distribution.

Laos: Houaphan (Hem district, Na Puok village, Pu Tham Nhon Mountain) and Louang Namtha (sine loc.) provinces,

Vietnam: Lam Dong province (Bidoup Mountains).

S. China (Yunnan), N. Thailand.