Bulbophyllum khaoyaiense Seidenfaden, Bot. Tidsskr. 65: 342. 1970.白花卷瓣兰 bai hua juan ban lan

Bulbophyllum tripudians E. C. Parish & H. G. Reichenbach var. pumilum Seidenfaden & Smitinand.

Pseudobulbs close, subovoid, 1.3-2 cm, 7-8 mm in diam., with 2 leaves at apex. Leaves deciduous at anthesis. Scape from base of pseudobulb, erect, 14-15.5 cm; raceme nodding, 5-6 cm, usually with more than 10 secund flowers; peduncle stout, ca. 2 mm in diam., with 2 or 3 membranous sheaths; floral bracts lanceolate, ca. 3 mm, apex acuminate. Pedicel and ovary ca. 2 mm. Flowers thinly textured, white, with purplish red lip. Dorsal sepal narrowly ovate-triangular, ca. 8 × 2 mm, adaxially sparsely with short hairs, margin entire, apex long acuminate; lateral sepals lanceolate, ca. 20 × 2.5 mm, abaxial base densely papillate, base adnate to column foot, twisted near base, with their lower edges connate to each other, margin entire, apex acuminate. Petals narrowly triangular, ca. 4 × 1.2 mm, margins sparsely fimbriate-ciliate, apex long acuminate; lip ca. 2 × 1 mm, fleshy, fleshy-thickened in apical half, with papillate hairs adaxially, base attached to end of column foot by a mobile joint. Column ca. 1.5 mm, base with a foot ca. 1 mm; stelidia subulate, ca. 1 mm, ± hooked; anther cap subglobose, apex densely papillate. Fl. Mar.

Tree trunks in forests; ca. 1400 m. S Yunnan [Thailand].