Epiphytic herb, 30-50 cm tall. Stem sappy, oblique, glabrous. Leaves strongly unequal in a pair; larger leaf in a pair: petiole 1-3 cm long, glabrous; blade papyraceous when dry, narrowly elliptic, 10-24 x 2.5-6.5 cm, margin entire, apex acuminate, base obliquely cuneate, glabrous on both faces; smaller leaf in a pair sessile, 0.5-5 x 0.3-1.5 cm, glabrous. Flowers solitary; epedunculate; pedicel 0.5-1.2 cm long, glabrous. Calyx pale green, lobes connate at base, 4 erect, dorsal lobe recurved, unequal with dorsal lobe much smaller, obliquely ovate, 2.2-2.7 x 0.8-1 cm, margin entire, apex obtuse, outside and inside glabrous; corolla oblique in calyx, creamy, 4 cm long, tube wide tubular, 2.7 cm long, base spurred, 0.5 cm wide, middle slightly curved, throat not contracted, 0.7 cm wide, outside glabrous, inside glabrous, limb 1.8 cm wide, lobes spreading, suborbicular, 0.5-0.8 x 0.5-0.8 cm, margin fimbriate, lower lobe larger, oblique; stamens included, inserted on corolla base; ovary obliquely ovoid, laterally compressed, 0.7 x 0.3 or 0.25 cm, apex minutely appressed-pubescent, style 0.8 cm long, glabrous, stigma large, capitate. Mature capsule dark violet, nearly black inside, obliquely ovoid, laterally compressed, 1.8 x 1 or 0.7 cm.
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