1. Acriopsis indica Wight, Icon. Pl. Ind. Orient. 5: t. 1748. 1851.
合萼兰 he e lan
Roots white, ca. 1.5 mm in diam., well developed, fleshy. Pseudobulbs oblong-ovoid, 2-2.5 × 1-1.3 cm, often narrowed at base, usually with 5-8 internodes, with lacerate sheaths on nodes. Leaves terminal, 2 or 3, appearing after anthesis; leaf blade narrowly oblong, 7-7.5 × 0.3-0.4 cm, base slightly contracted into a short petiole, apex acuminate. Inflorescence paniculate, arising from basal node of pseudobulb, erect or slightly drooping, much longer than leaves, 11-38 cm, laxly many flowered; peduncle 6-7 cm, with 2 or 3 small sheaths; floral bracts 0.5-2.5 × 0.3-0.8 mm. Flowers yellowish green, slightly spotted with purple, lip white; ovary 2.3-2.5 mm. Dorsal sepal suboblong, 4-5 × ca. 1 mm, 3-veined, base contracted, slightly concave, apex acuminate; synsepal similar to dorsal sepal, but slightly larger, with 5 inconspicuous veins. Petals obovate-spatulate, 3-4 × ca. 1.3 mm, margin sometimes irregularly crisped, apex obtuse; lip suboblong, 4-5 × ca. 1.4 mm, adaxially with 2 suborbicular central lamellae, apex obtuse or subrounded. Column ca. 4 mm, stelidia ca. 0.8 mm, without foot; anther cap ca. 0.7 mm in diam.; pollinia narrowly obconic, ca. 0.7 mm. Capsule ellipsoid or globose. Fl. May.
Epiphytic on trunks of Quercus trees; ca. 1300 m. S Yunnan [Cambodia, Indonesia, Laos, Malaysia, Myanmar, ?NE India, Philippines, Thailand, Vietnam].