云南角盘兰 yun nan jiao pan lan

Monorchis yunnanensis (Rolfe) O. Schwarz.

Plants 15-26 cm tall. Tubers ovoid to ovoid-oblong, 5-15 × 5-10 mm. Stem with 2 tubular sheaths at base, 1-leaved. Leaf basal, linear to linear-oblong, 4.5-13 × 0.4-1 cm, apex acute. Inflorescence 12-22 cm; peduncle cylindric, with a few ovate-lanceolate sterile bracts; rachis 4-6.5 cm, densely many flowered; floral bracts ovate, 3-4 mm, shorter than ovary, apex acuminate. Flowers erect, yellowish green; ovary straight, ca. 5 mm including pedicel. Dorsal sepal suberect, ovate, concave, ca. 2 × 1.2 mm, 1-veined, apex obtuse; lateral sepals spreading, subovate, ca. 2.5 × 1.2-1.5 mm, 1-veined, apex obtuse. Petals forming a loose hood with dorsal sepal, ovate, ca. 1.5 × 1.2 mm, 1-veined, apex subacute; lip horizontal to slightly pendulous, oblong, 2.2-2.5 × ca. 1.8 mm, somewhat fleshy, base concave, apex 3-toothed to shallowly 3-lobed; lateral lobes triangular, small, apex acute; mid-lobe triangular, broader than lateral lobes, apex acute. Column ca. 1 mm; pollinia globose; viscidia ovoid; rostellum clavate-oblong, 2-lobed. Fl. Aug-Sep.

● Grassy slopes; 2200-3300 m. C and W Yunnan.

This species seems very close to Schlechter’s Herminium coiloglossum. More material on which to base a critical comparison is needed.