Plants climbing. Rhizome nearly creeping, ca. 1 cm in diam., with many sparse, broadly ovate, fleshy scales. Stem 1-3 m, branched, lower part almost glabrous, upper part slightly pubescent, often with 1 aerial root at each node. Inflorescence large, branched, composed of many racemes and panicles; lateral racemes or panicles 5-16 cm; rachis ± rusty pubescent, bearing flowers in succession near apex; basal sterile bracts ovate, 1-2 cm, glabrous, amplexicaul; floral bracts ovate, 2.5-4 mm, abaxially hairy; pedicel and ovary 1-1.2 cm, with short hairs. Flowers yellow, ± with orange-red veins adaxially. Sepals subelliptic, 1.2-1.4 × 0.6-0.8 cm, lateral sepals obviously wider than dorsal sepal, abaxially ± hairy when young. Petals similar to dorsal sepal, glabrous; lip suborbicular, strongly concave, slightly shorter than sepals, shortly hairy adaxially, near base with 1 callus. Column strongly curved, ca. 5 mm. Fl. Apr-Jun.
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