白花贝母兰 bai hua bei mu lan

Coelogyne leucantha var. heterophylla Tang & F. T. Wang.

Rhizome rigid, 5-7 mm in diam., densely covered with lucid, scaly sheaths, with rather short internodes. Pseudobulbs 1-2 cm apart from each other, ovoid-oblong, 1.5-3(-5) cm × 8-15 mm, with 2 leaves at apex and several sheaths at base; sheaths ovate to lanceolate, 2.5-6.5 cm, lucid. Leaf blade oblanceolate to oblong-lanceolate, (5-)10-15 × 1.1-3 cm, base cuneate, apex subacuminate; petiole (1.5-)4-9.5 cm. Inflorescence hysteranthous, 15-20 cm, with imbricate, convolute, sheathing sterile bracts at interface between peduncle and rachis forming a tube 1.5-3 cm; rachis 3-11-flowered, thickened in lower part; floral bracts caducous; pedicel and ovary ca. 10 mm. Flowers white, slightly spotted with yellow on lip. Sepals suboblong, 13-18(-25) × 3.5-4.5 mm, 5-veined, apex acuminate. Petals filiform, nearly as long as sepals, ca. 0.7 mm wide, 1-veined, apex acute; lip nearly ovate-oblong, 13-17(-24) × 7-11 mm, 3-lobed; lateral lobes erect, obtuse; mid-lobe nearly elliptic, 6-10 × 4-7 mm, margin irregularly dentate; callus with 3 longitudinal lamellae extending from base to ca. middle of mid-lobe, median lamella shorter; lamellae straight, crisped-crenate. Column suberect, 10-14(-21) mm, both sides winged; wings very narrow in lower part, widened toward upper part, ca. 0.7 mm wide on one side. Capsule obovoid-oblong, trigonous, 1.6-1.8 × 0.7-0.9 cm. Fl. May-Jul, fr. Sep-Dec.

On tree trunks in forests or rocks along valleys; 1500-2600 m. SW Sichuan, NW, S, and W Yunnan [N Myanmar].