西藏角盘兰 xi zang jiao pan lan

Monorchis orbicularis (J. D. Hooker) O. Schwarz.

Plants 6-15 cm tall. Tubers subglobose to ovoid, 4-8 × 4-6 mm. Stem with 1 tubular sheath at base, 2-leaved. Leaves basal and subopposite, or cauline, somewhat spaced and alternate, oblanceolate to elliptic-oblong, 1.2-3 × 0.3-1.5 cm, adaxially with white reticulate markings, apex obtuse or acute. Inflorescence 4-14 cm; peduncle cylindric, with 1 to several lanceolate sterile bracts 2-6 mm; rachis 1-4 cm, laxly few to subdensely many flowered; floral bracts ovate-lanceolate, 1-2.5 mm, shorter than ovary, apex acute. Flowers usually secund, erect or horizontal, green; ovary straight to slightly arcuate, 2-4 mm. Dorsal sepal suberect, broadly ovate, ca. 0.8 × 0.5 mm, 1-veined, apex obtuse; lateral sepals weakly spreading, broadly orbicular-ovate, ca. 1.2 × 0.8 mm, 1-veined, apex obtuse. Petals forming a hood to weakly spreading, oblong-ovate, ca. 0.8 × 0.5 mm, 1-veined, apex obtuse; lip slightly decurved, orbicular-ovate, ca. 1.5 × 1.2 mm, fleshy, shortly spurred, entire, apex obtuse; disk slightly warty; spur conic, ca. 0.7 mm. Column ca. 0.4 mm; pollinia clavate; viscidia orbicular. Fl. Jul-Sep.

Valleys; ca. 3700 m. Xizang [Bhutan, India (Sikkim)].