二花对叶兰 er hua dui ye lan

Listera biflora Schlechter, Acta Horti Gothob. 1: 143. 1924.

Plants autotrophic, 10-13 cm tall. Rhizome with a few elongate, filiform roots. Stem cylindric, slender, with 1 sheath toward base. Leaves 2, opposite, borne above middle of plant, subsessile, unequal in size (one distinctly larger than other), larger one broadly ovate, 1.2-1.8 × 0.8-1.4 cm, smaller one narrowly ovate, 1-1.5 × 5-7 mm, both with bases rounded and apices acute. Peduncle 2-2.5 cm, pubescent, lacking sterile bracts; rachis very short, sparsely pubescent or almost glabrous, 1- or 2-flowered; floral bracts ovate-lanceolate, 3-5 × ca. 0.8 mm, shorter than pedicel, apex acute. Flowers resupinate, green; pedicel 4-6 mm, nearly glabrous; ovary 4-5 mm, glabrous; sepals and petals not spreading widely. Dorsal sepal ovate-elliptic, 6-7 × 1.2-1.8 mm, outer surface carinate, apex obtuse; lateral sepals linear-lanceolate, ca. 7 × 1 mm, outer surface carinate, apex acute. Petals linear, ca. 6.5 × 1 mm, apex obtuse or acute; lip spreading forward, cuneate, 8-10 × 4-5.5 mm, apex truncate-rounded and shallowly notched, usually with a minute tooth in notch; disk with a groove at base, midvein slightly thickened. Column slightly arcuate, 3-4 mm; anther inclined toward rostellum; rostellum large, but shorter than anther. Fl. Jul.

● Forests; 3000-3900 m. NW Sichuan (Songpan).