恒春银线兰 heng chun yin xian lan

Odontochilus koshunensis (Hayata) S. S. Ying.

Plants ca. 20 cm tall. Stem ascending, 2-4-leaved. Leaves abaxially reddish purple, adaxially blackish green with white venation, ovate to orbicular-ovate, 3-4 × 2-3 cm, apex acute; petiole-like base and tubular sheath ca. 1 cm. Peduncle 7-10 cm, with 2 or 3 sheathing sterile bracts, reddish brown; rachis ca. 4.5 cm, 5- or 6-flowered; floral bracts pinkish, ovate to ovate-lanceolate, ca. 7 mm, shorter than ovary, outer surface pubescent. Flowers suberect, not resupinate, white; ovary and pedicel cylindric-fusiform, not twisted, ca. 12 mm, pubescent. Sepals reddish brown, pubescent on outer surface, 1-veined; dorsal sepal orbicular-ovate, cymbiform, 5-5.5 × 3-4 mm, apex acute to cuspidate; lateral sepals spreading, narrowly elliptic, oblique, 7-8 × 3.5-4 mm, apex acute. Petals white, ovate-elliptic, strongly oblique, falcate, 5.5-6 × 1.5-2 mm, 1-veined, apex cuspidate and incurved; lip white, Y-shaped, ca. 10 mm; hypochile 1-2 mm; mesochile reflexed at right angle from apex of hypochile, 3-4 mm; flanges oblong to linear-lanceolate, 4-5 × ca. 2 mm, entire or sometimes shallowly notched at apex; epichile longitudinally dilated, 2-lobed; lobes diverging at an acute angle to one another, oblong, 7-9 × 3.5-3.7 mm, apex obtuse to slightly mucronate; spur tubular-conic, 4-6 mm, mouth ca. 2 mm in diam., apex deeply bilobed, containing 2 irregular, stalked calli. Column ovoid, 3-3.5 mm, with 2 lamellate wings; stigma lobes orbicular. Fl. Jul-Oct.

● Broad-leaved evergreen forests; 700-2000 m. Taiwan.