Rootstocks a cluster of fusiform roots. Stems erect to 35 cm, or twining, basal part leafless, minutely puberulent. Petiole 3-10 mm, narrowly winged, puberulent; leaf blade elliptic or elliptic-lanceolate, 1-4(-5) × 0.4-1.6(-2.3) cm, abaxially glabrous except for midvein, adaxially densely minute puberulent, base cuneate or attenuate into indistinct petiole, margin somewhat undulate, apex acute or short acuminate; lateral veins obscure. Inflorescences subsessile, 1-or 2(-5)-flowered; peduncle 0-4(-20) mm. Pedicel 0.4-1.7 cm, sparsely puberulent. Sepals linear-triangular, to 7 × 0.9 mm, sparsely puberulent. Corolla yellow or green with purple markings, (2.3-) 4.3-4.9 cm, (4-)5.5-7 mm wide near base; tube uniformly colored, 2-3.4 mm wide, increasing gradually to (6-)9-12 mm wide at throat, glabrous outside; lobes (0.7-) 1.4-2.5 cm, strongly revolute, widest just above base, erect with strongly incurved tip, base pale with fine dark veins, apical part dark, densely pubescent, puberulent inside. Outer corona lobes triangular, pilose; inner lobes linear, slightly dilated toward apex, obtuse, glabrous, twice as long as outer. Fl. May-Jul, fr. Oct.
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