白花拟万代兰 bai hua ni wan dai lan

Vanda undulata Lindley, J. Proc. Linn. Soc., Bot. 3: 42. 1858; Stauropsis polyantha W. W. Smith; S. undulatus (Lindley) Bentham ex J. D. Hooker.

Stems ascending or pendulous, cylindric, to 1 m, 6-8 mm in diam., rigid, branching, many noded, internodes 2.5-4 cm. Leaves oblong, 9-12 × 1.5-2.5 cm, leathery, obtuse, unequally bilobed; basal sheaths persistent and amplexicaul, verrucose. Inflorescence to 50 cm, usually with a few branches, laxly few flowered; peduncle and rachis stout; floral bracts green, broadly ovate, 6-8 mm, obtuse. Flowers fragrant, 3-3.6 cm in diam.; sepals and petals white, lip yellow to white at apex, lemon-yellow with purple-red basal striations, anther cap yellow; pedicel and ovary ca. 2.7 cm, white. Dorsal sepal subobovate, 2.5-4 × 0.8-1.2 cm, base clawed, margin crisped, apex obtuse; lateral sepals slightly recurved, ovate-lanceolate, 2.4-4 × 1.2-1.4 cm, margin crisped, apex subacuminate. Petals slightly recurved, similar to sepals but smaller, margin undulate, apex obtuse; lip shorter than petals, 3-lobed; lateral lobes erect, ± embracing column, subovate-triangular, ca. 5 mm, acute; mid-lobe laterally compressed, spatulate, ca. 6 × 5 mm, concave, truncate; disk with 2 ridges from base. Column ca. 4 mm; anther cap subglobose; stipe sublanceolate, ca. 2 mm; viscidium subensiform, wider than stipe, thick. Fl. May-Jun. 2n = 38.

Epiphytic on tree trunks in forests or lithophytic on rocks on shrubby slopes; 1500-2300 m. SE Xizang, S and W Yunnan [Bhutan, NE and NW India, Nepal].