扁茎羊耳蒜 bian jing yang er suan

Herbs, epiphytic. Pseudobulbs densely arranged, ovoid-fusiform, slightly compressed, 1.5-2.5 cm × 6-10 mm, upper part with 3 or 4 spaced leaves. Leaf blade narrowly oblong-oblanceolate, 3.5-6 × 0.5-1 cm, base contracted into a short petiole, articulate, apical half slightly crisped-margined, apex acuminate. Scape 10-13 cm, nearly wingless, with many sterile bracts 4-6 mm; raceme 5-7 cm, more than 10-flowered; floral bracts lanceolate, 2-3 mm. Flowers orange; pedicel and ovary 3-4 mm. Dorsal sepal narrowly ovate-oblong, 4.8-5.8 × ca. 1.6 mm, 1-veined, abaxially carinate, apex obtuse; lateral sepals oblong-ovate, 4.5-5.5 × 2-2.3 mm, abaxially somewhat carinate. Petals narrowly linear, 5-5.5 × ca. 0.7 mm, apex ± emarginate and sinus apiculate; lip broadly obovate-oblong, ca. 4 × 2.7 mm, near base abruptly contracted and with 2 callus-shaped and thickened folds, base inconspicuously with 2 suborbicular lobes on both sides, centrally with 1 thickened, concave callus, apex truncate and emarginate. Column erect, ca. 2 mm, ventrally with a pair of broad wings, lower part with a second pair of arcuate wings on both sides. Fl. Nov.

On tree branches in forests; 800-2100 m. S and W Yunnan [India].