Microstylis wallichii var. biloba King & Pantling
Terrestrial. Stems elongate ovoid to clavate, fleshy, 2.5-4 cm tall, 8-17 mm in diam., surrounded by sheath-like petiole. Leaves 3 or 4, green, more or less lustrous, elliptic-oblong, 9-14 cm long, 3.5-5.5 cm wide, apex acute, base slightly oblique, continuous into sheathing petiole 3-8 cm long. Peduncle terminal, green or purplish, 5-10 cm long, 4-ridged; flower bearing portion of racemes 7-12 cm long; bracts linear-lanceolate, 6-7 mm long, 1.5 mm wide; pedicel and ovary ca. 6-10 mm long, with raised sharp, wavy ridges. Flowers 20-30, purple or yellowish green; dorsal sepal ovate-lanceolate, 5-6 mm long, 2-
2.5 mm wide, strongly revolute; lateral sepal broadly ovate or elliptic, 4-5 mm long, 2.5-4 mm wide, central concave, margin revolute; petals linear, 5-5.5 mm long, 0.8-1.3 mm wide, revolute; lip sagittate, 6 mm long, base extending into 2 falcate-triangular auricles ca. 2.5 mm long, apex usually bent forward, deeply 2-lobulate for 4/5 its length, lobules parallel, oblong; base of disc with a depression or cavity surrounded by fleshy raised wall; column 1.5 mm long, with fleshy lateral arms apically; anther nearly white, oval-orbicular, 0.5 mm long; pollinia waxy, obliquely ellipsoid; rostellum thin, shallowly 2lobed. Capsules fusiform, 1.5 cm long, pedicel 5 mm long.
NANTOU: Vicinity of Chushan, Leou 6193. KAOHSIUNG: Sanping, Su & Chen 9087*. PINGTUNG: Tahan, Su & Chen 9337.
Sikkim, southern China, Indochina, Thailand, Sri Lanka and the Philippines. Taiwan, broadleaved forests, 300-800 meters in the central and southern mountainous regions.