白柱万代兰 bai zhu wan dai lan

Vanda denisoniana Benson & H. G. Reichenbach var. hebraica H. G. Reichenbach; V. henryi Schlechter.

Stems ca. 15 cm, 1-1.8 cm in diam. Leaf blade 22-30(-35) × 1.7-3 cm, thick, apex unequally 2-lobed. Inflorescences 1-3, 10-20(-25) cm, sparsely 3-5-flowered; peduncle 7-18 cm; floral bracts broadly ovate, 3-4 × 3-3.5 mm, apex obtuse. Flowers thickly textured, widely opening, 3.5-4 cm in diam.; pedicel and ovary white, 55-90 mm; sepals and petals abaxially white, adaxially yellowish green or yellowish brown tessellated with purplish brown. Sepals subsimilar, lateral sepals slightly wider than dorsal, spatulate, 22-25(-27) × 14-17 mm, base clawed, apex rounded. Petals spatulate, 19-22 × 9-12 mm, base clawed, apex rounded; lip shorter than sepals, fleshy, spurred; lateral lobes erect, white or yellowish white, broadly ovate, 7-9 × 7-8 mm, apex obtuse; mid-lobe yellowish green or pale brown, with white base and 2 brownish red stripes on both basal sides, pandurate, 16-18 × 7-8 mm, base with a pair of calli, apex broadly emarginate; spur white, broadly conic, 6-7 × 0.5-0.6 mm, apex acute-obtuse. Column white and slightly tinged with pale purple, 5-7 mm; anther cap yellowish white, 5-6 mm wide; pollinia ca. 2 mm in diam.; stipe subovate-triangular, ca. 4 mm; viscidium oblate, 4-5 mm wide. Fl. Mar. 2n = 38, 76.

On tree trunks in open forests or at forest margins; 800-2000 m. S Yunnan [Myanmar, Thailand, Vietnam].