16. Cleisostoma nangongense Z. H. Tsi, Bull. Bot. Res., Harbin. 9(2): 26. 1989.
南贡隔距兰 nan gong ge ju lan
Plants pendulous. Stems more than 40 cm, slender, ca. 3 mm in diam., branched or unbranched, many leaved, internodes ca. 2 cm. Leaves subterete, to 17 cm × ca. 3 mm, slender, channeled adaxially, fleshy, apex acuminate. Inflorescence lateral, usually unbranched, many flowered; peduncle ca. 4 cm; rachis pale purple, ca. 6 cm, slender; floral bracts ovate, ca. 1 mm, membranous, obtuse. Flowers opening widely, ± fleshy; sepals and petals yellowish green, tinged with purple, lip, column, and anther cap yellowish white; pedicel and ovary yellowish green, tinged with purple, 6-7 mm. Dorsal sepal ovate-elliptic, concave, ca. 5 × 3.5 mm, margin irregularly denticulate, apex obtuse; lateral sepals slightly oblique, oblong, ca. 5 × 4 mm, margin often sparsely denticulate, apex obtuse. Petals obliquely ovate-oblong, ca. 4.5 × 2 mm, margin irregularly denticulate, apex obtuse; lip lateral lobes subtriangular, apex incurved, proximal margin inflexed and square in shape, with a horn-shaped appendage near apex; mid-lobe sagittate-triangular, thickly fleshy, obtuse, with a circular basal callus; spur dorsiventrally compressed, subtruncate, ca. 4 × 3 mm, front surface with a channel, interior conspicuously septate, back wall callus 3-lobed; callus T-shaped; lateral lobules adnate to wall; mid-lobule slightly concave centrally, with 2 recurved basal lobules. Column ca. 3 mm; rostellum short; anther cap slightly elongate, truncate; stipe nearly suborbicular; viscidium saddlelike, large. Fl. Jun.
● Epiphytic on tree trunks in broad-leaved evergreen forests; ca. 1700 m. S Yunnan.