Plants climbing, to several meters long. Stem cylindric, slender, with many branches, curved or twisted, reddish brown or greenish brown, nodes ± dilated, with scales. Inflorescence large, much branched, branch 5-15 cm or longer, sometimes lateral racemes branched again; rachis rather slender, glabrous; floral bracts persistent, subtriangular, 2-3 mm, glabrous; pedicel and ovary ca. 8 mm, glabrous. Flowers whitish yellow or pale yellow, slightly spotted with brown, not opening widely. Sepals suboblong, 1.2-1.5 × 0.3-0.5 cm, glabrous. Petals oblong, slightly shorter and narrower than sepals; lip slightly tinged with brown, subobovate, concave, ca. 1 cm, apex slightly 3-lobed, centrally with 1 longitudinal ridge ca. 5 mm extending from base to middle; longitudinal ridge slightly divergent at apex and then with a woolly callus near its apex, both sides of ridge with many transversely papillary stripes vertical to ridge. Column 6-7 mm. Capsule reddish, narrowly cylindric, 13-22 cm × 5-10 mm, surface smooth. Seeds with surrounding wing less than 1 mm wide, wing cleft on one side. Fl. Apr-May, fr. Aug.
Home