Odontochilus clarkei J. D. Hooker Fl. Brit. India. 6: 100. 1890.

红萼齿唇兰 hong e chi chun lan

Anoectochilus clarkei (J. D. Hooker) Seidenfaden & Smitinand; Cystopus clarkei (J. D. Hooker) Kuntze.

Plants autotrophic, to 30 cm tall. Stem ascending or erect, ca. 5 mm in diam., 5- or 6-leaved. Leaves abaxially pale green, adaxially dark green, ovate, ovate-elliptic, or elliptic, oblique, 4-6 × 2-3 cm, apex acute; petiole-like base and tubular sheath 2-2.5 cm. Peduncle 3-5 cm, with 1 or 2 sheathing sterile bracts, pubescent; rachis 4-7 cm, subdensely many flowered; floral bracts purplish red, lanceolate, to 13 mm, slightly exceeding ovary, outer surface pubescent, apex acuminate. Flowers resupinate; ovary and pedicel twisted, cylindric, 8-10 mm, pubescent. Sepals purplish red with a deep purplish red stripe on either side of midvein, outer surface glabrous to sparsely pubescent, 1-veined; dorsal sepal forming a hood with petals, ovate, ca. 5 × 3.2 mm, apex acuminate-caudate; lateral sepals broadly ovate-elliptic, oblique, ca. 9 × 5.5 mm, apex subobtuse. Petals yellow, tinged red and with a deep purplish red stripe on either side of midvein, ovate, strongly oblique, falcate, ca. 6 × 2.5 mm, 1-veined, apex long acuminate; lip Y-shaped, 18-20 mm; hypochile slightly dilated, globose-saccate, ca. 3 mm, aseptate but sometimes shallowly 2-lobed, containing 2 fleshy, somewhat acerose, hooked calli near center; mesochile ca. 5 mm, expanded at base into an orbicular to obcordate plate, reddish, with a pectinate flange along each margin; flanges composed of 2 or 3 obtuse teeth; epichile yellow, longitudinally dilated, 2-lobed, apiculate in sinus between lobes; lobes diverging widely, obovate-cuneate, ca. 10 × 5 mm, apex truncate. Column ca. 2 mm, stout, with 2 elliptic wings; anther ovoid-lanceolate; pollinia attached to a small, elliptic viscidium; rostellum erect, remnant bifid; stigma lobes separate. Fl. Sep.

Shaded places in evergreen broad-leaved forests; ca. 1100 m. SE Xizang [India (Sikkim), Myanmar].