Description from Flora of China
Leptorkis luteola (Lindley) Kuntze.
Herbs, epiphytic or lithophytic. Pseudobulbs somewhat densely arranged, subovoid, 6-7 × 4-5 mm. Leaves 2; petiole 1-1.5 cm, articulate; blade linear or linear-oblanceolate, (4-)6-14 × 0.4-0.9 cm, papery, apex acuminate. Inflorescence 6-16 cm; peduncle somewhat compressed, narrowly winged, sometimes with 1 sterile bract; rachis 3-6 cm, several to 10-flowered; floral bracts lanceolate, 3-4(-6) mm. Flowers whitish green or yellowish green; pedicel and ovary 9-14 mm. Sepals lanceolate-linear or linear, ca. 4 × 1 mm, midvein slightly raised abaxially, apex obtuse; lateral sepals to 1.5 mm wide. Petals filiform, ca. 4 × 0.3 mm; lip oblong-obovate, ca. 3.5 × 2.8 mm, with a thick longitudinal ridge near base, with a bilobed callus in front of ridge, apex emarginate and sinus apiculate. Column slightly arcuate, ca. 2.5 mm, slender, upper part winged. Capsule obovoid, 7-9 × 3-4 mm; fruiting pedicel 6-9 mm. Fl. and fr. Dec-Feb. 2n = 38.
On trees or rocks in forests. N, E, and W Hainan [India, Myanmar, N Thailand, Vietnam].