喇叭唇石斛 la ba chun shi hu

Callista lituiflora (Lindley) Kuntze; Dendrobium hanburyanum H. G. Reichenbach.

Stems pendulous, cylindric, 30-40 cm or longer, 7-10 mm in diam., slightly fleshy, unbranched, with many nodes, internodes 3-3.5 cm. Leaves narrowly oblong, 7.5-18 × 1.2-1.5(or more) cm, leathery, base sheathing, apex acuminate and slightly hooked on one side. Inflorescences many, arising from old leafless stems, 1- or 2-flowered; peduncle nearly perpendicular to stem, 5-10 mm; basal sheaths 3 or 4, pale white, to 1.5 cm, papery, apex obtuse; floral bracts pale white, ovate, 1-13 mm, apex subacute. Pedicel and ovary ca. 2.5 cm. Flowers spreading, purple, large, membranous; inner surface of lip with a deep purple spot surrounded by a white circle. Dorsal sepal oblong-lanceolate, ca. 35 × 7 mm, 7-veined, apex acute; lateral sepals similar to dorsal sepal and equal in size, 7-veined, base slightly oblique; mentum subglobose, ca. 4 mm. Petals subelliptic, ca. 40 × 15 mm, 7-veined, margin entire, apex acute; lip subobovate, shorter than petals, embracing column on both sides and trumpet-shaped below middle, adaxially densely barbellate, margin irregularly denticulate. Column ca. 4 mm, base dilated; anther cap conic, finely papillate, front margin entire, apex ± truncate and concave.

Epiphytic on tree trunks in broad-leaved forests; 800-1600 m. SW and W Guangxi, SW Yunnan (Zhenkang) [NE India, Laos, Myanmar, Thailand, Vietnam].