短柱齿唇兰 duan zhu chi chun lan

Anoectochilus brevistylis (J. D. Hooker) Ridley; A. candidus (T. P. Lin & C. C. Hsu) K. Y. Lang; A. inabae Hayata var. candidus (T. P. Lin & C. C. Hsu) S. S. Ying; A. tonkinensis Gagnepain; Cystopus brevistylis (J. D. Hooker) Kuntze; Odontochilus candidus T. P. Lin & C. C. Hsu; O. inabae (Hayata) Hayata var. candidus (T. P. Lin & C. C. Hsu) S. S. Ying.

Plants autotrophic, 12-18 cm tall. Stem ascending, dark purple-brown, 3-4 mm in diam., 4- or 5-leaved. Leaves abaxially pale green, adaxially dark green, ovate-lanceolate to oblong, oblique, 2.5-5 × 1-2 cm, apex acute; petiole-like base and tubular sheath 1-1.5 cm. Peduncle 6-8 cm, pubescent, with 1 or 2 sterile bracts; rachis 4-7 cm, subdensely 5-9-flowered, pubescent; floral bracts lanceolate, 10-15 mm, subequal in length to or exceeding ovary, outer surface pubescent, apex acuminate. Flowers resupinate, white or yellowish white; ovary and pedicel twisted, cylindric-fusiform, 9-10 mm, glabrous. Sepals yellowish green, outer surface pubescent, 1-veined; dorsal sepal forming a hood with petals, ovate, cymbiform, 6-6.5 × 4-4.5 mm, apex acute; lateral sepals ovate-elliptic, oblique, 9-10 × 3.5-3.7 mm, apex subobtuse. Petals white, ovate, strongly oblique, falcate, 6-6.5 × ca. 3 mm, glabrous, 1-veined, apex long apiculate; lip white or yellowish white, Y-shaped, 16-18 mm; hypochile slightly dilated, bisaccate, ca. 2 mm, containing a central longitudinal septum and 1 fleshy, hooked callus on either side; mesochile 6-8 mm, with a pectinate flange along each margin; flanges composed of 4 or 5 filaments to ca. 3 mm and 3 or 4 shorter obtuse teeth; epichile longitudinally dilated, ca. 6 × 8 mm, 2-lobed; lobes diverging at an acute angle to one another, obovate-flabellate, ca. 5.5 × 3.5 mm, margin slightly crenulate, apex obtuse. Column twisted, ca. 3 mm, stout, with 2 lamellate wings; anther ovoid, short, apex obtuse; pollinia attached to 1 small, narrowly elliptic viscidium; rostellum broad, bifid; stigma lobes separate. Fl. Aug. 2n = 40, 42.

Damp places in evergreen broad-leaved forests; 1700-1900 m. SE Xizang, Yunnan [Malaysia (Peninsular), Thailand, Vietnam].