Thelasis triptera Rchb. f.
Plants 5-10 cm tall. Pseudobulbs tufted, depressed globose, 2-5 mm tall, 2-or rarely 1-leaved at top. Leaves usually 2, one often larger, linear or elongate-oblong, sometimes falcate, 5-13 cm long, 7-10 mm wide, obtuse or unequally 2-lobed at apex, cuneate and conduplicate at base, coriaceous. Peduncle arising from base of pseudobulb, 4-7 cm tall, terete, glabrous; rachis gradually lengthening, 1.5-5 cm long, bearing many closely arranged flowers; bracts ovate-triangular, 2.5-3 mm long, 2.5 mm wide, acuminate, persistent; pedicel and ovary nearly perpendicular to rachis, 4 mm long, flattened, with lateral wings. Flowers yellowish green, few producing succesively, non-resupinate, not opening; dorsal sepal ovate-oblong or oblong-triangular, 2.5 mm long, 1 mm wide; lateral sepals conduplicate, navicular, 3 mm long, fleshy, with porous surfaces, outer sides keeled and continuous to wings of ovary; petals elongate oblong, 2 mm long, 0.5 mm wide, obtuse or subacute; lip immobile, cohering with base of column, ovate or triangular-ovate, involute near apex, 2 mm long, 1.5 mm wide when expaned; column 0.5 mm long, 3-fid at apex; anther elongate ovate, 1 mm long; pollinia ovoid-clavate.
KAOHSIUNG: Maolin, Lin 189. HUALIEN: Yuenhai, Segawa s. n.* 15 Aug 1934; Shenmiku, Lin 412.
India, the Himalaya, Myanmar, southern China, Vietnam, Thailand, Malaysia and the Philippines. Taiwan, rare, forests at low elevations.