Cleisostoma birmanicum (Schlechter) Garay Bot. Mus. Leafl. 23: 170. 1972.

美花隔距兰 mei hua ge ju lan

Echioglossum birmanicum Schlechter, Notizbl. Bot. Gart. Berlin-Dahlem 8: 125. 1922; Sarcanthus birmanicus (Schlechter) Seidenfaden & Smitinand; S. ophioglossa Guillaumin.

Stems erect, elongate, 8-9 cm, stout, ca. 6 mm in diam., unbranched, with many leaves and verrucose roots. Leaves narrowly lanceolate, ca. 15 × 1.5 cm, thickly fleshy, obtuse and unequally bilobed. Inflorescence lateral, arching, longer than leaves, branching, many flowered; floral bracts ovate-triangular, 2-3 mm, thickly textured, obtuse. Flowers widely opening, fleshy, sepals and petals purplish brown with yellowish green margins and midvein, lip white, column purple; pedicel and ovary purplish brown, ca. 1 cm. Dorsal sepal elliptic, ca. 12 × 5 mm, obtuse; lateral sepals obliquely ovate, ca. 9 × 6 mm, obtuse. Petals subfalcate-oblong, ca. 10 × 4.5 mm, obtuse; lip lateral lobes erect, falcate-lanceolate, acute; mid-lobe triangular, ca. 6 mm wide, acute and deeply divided into 2 tails; spur subconic, straight, ca. 5 × 2 mm, apex obtuse, interior longitudinally septate, with a back wall callus; callus hollow, subtriangular, base slightly bilobed and densely minutely papillate. Column ca. 4 mm, stout; anther cap truncate and broadly emarginate; stipe deltoid, small; viscidium crescent-shaped or saddle-shaped, large. Fl. Apr-May.

Hainan [Myanmar, Thailand, Vietnam].