短柱对叶兰 duan zhu dui ye lan

Listera mucronata Panigrahi & J. J. Wood, Kew Bull. 29: 731. 1975.

Plants autotrophic, 40-50 cm tall. Rhizome with many elongate, filiform roots. Stem 15-22 cm, somewhat stout, with 1 or 2 sheaths toward base. Leaves 2, opposite, borne at ca. middle of plant, sessile, broadly ovate to subcordate, 5-7.5 × 4.4-7.9 cm, base broadly cuneate or subcordate, apex acute. Peduncle 6-15 cm, pubescent, with 2 or 3 sterile bracts 3-5 mm; rachis 15-17.5 cm, laxly 12-17-flowered; floral bracts ovate-lanceolate, 3-5 mm, 1-veined, apex acuminate. Flowers resupinate, green; pedicel 4.5-7 mm, pubescent; ovary fusiform, 3.5-5 mm, pubescent; sepals and petals spreading widely. Dorsal sepal elliptic or ovate-elliptic, 4-5 × ca. 1.2 mm, 1-veined, apex obtuse; lateral sepals ovate, oblique, ca. 5 × 1.5 mm, apex obtuse. Petals linear or spatulate-linear, ca. 5 × 0.6 mm, apex obtuse-rounded; lip pendulous or spreading forward, subobovate-cuneate, 8-10 × 6-7 mm, narrowing to ca. 2 mm wide at base, apex deeply 2-lobed; lobes divergent, suboblong, 3.5-4 × 2-3 mm, margins minutely papillose-ciliate; sinus with small tooth between lobes; disk with a distinct thickened central ridge extending from base of lip and continuous with tooth in sinus. Column 1-1.5 mm; anther inclined toward rostellum; rostellum large. Fl. Jul-Aug.

Shaded places in forests; ca. 2400 m. SW Sichuan, Yunnan [Bhutan, India, Japan, Nepal].