五指山石豆兰 wu zhi shan shi dou lan

Rhizome creeping, rooting from nodes of rhizome and base of pseudobulbs, roots spreading. Pseudobulbs 1-4 cm apart from each other, ovoid, ca. 0.5 cm, ca. 3 mm in diam., with a terminal leaf. Petiole 2-4 mm; leaf blade oblong, 1.5-3 × 0.8-1 cm, leathery, apex retuse. Scape from base of pseudobulb or node of rhizome, erect, 3.5-4 cm, slender; inflorescence 1-flowered or a shortened, umbel-like raceme, 2- or 3-flowered; peduncle ca. 0.5 mm in diam., with 3-5 bracts; floral bracts lanceolate, ca. 2 mm. Pedicel and ovary 10-15 mm. Flowers white. Sepals free, ovate-triangular, ca. 6 × 3 mm, apex acuminate; lateral sepals ca. 7 × 3 mm, adnate to column foot for more than 1/2 their width; mentum inconspicuous. Petals ovate, ca. 4 × 1.5 mm, entire, obtuse; lip ovate, ca. 4 × 1.5 mm, fleshy, grooved in basal half, adaxially with 2 ridges, apex obtuse. Column 1-1.5 mm; stelidia very short, rounded; foot 1.5-2 mm. Pollinia 2. Fl. Oct.

● Tree trunks in moist tropical forests; ca. 1800 m. Hainan.

The almost vestigial, rounded stelidia are unusual in the section.