Herbs (perennial), scandent, 2-4 m tall. Basal parts unknown. Stems 3-5 mm in diam. (thinner distally), with numerous leaves, much branched; accessory branches common. Middle cauline leaves: petiole ca. 6 cm; blade glaucous abaxially, triangular, 10-15 × 14-18 cm, triternate; primary and secondary pinnae long petiolulate, ultimate leaflets shortly stalked, decurrent on petiolule, ovate, 1.5-3 × 1-2 cm, lobed into 3-6 broadly obovate to oblong obtuse lobes not overlapping. Leaves of lateral branches much smaller and less divided, shortly stalked to sessile. Racemes several at stem and branch tips, 10-25-flowered, simple or with a basal branch; bracts lanceolate, 1.5-3(-5) mm, acute. Pedicel 4-6 mm, thin, straight in flower, recurved in fruit. Sepals ca. 0.5 × 1 mm, dentate. Corolla yellow; outer petals with broad limb abruptly narrowed into acuminate apex; upper petal 14-16 mm, with crest attenuate in both directions, reaching almost to tip of spur; spur strongly upcurved, cylindric, 8-9 mm; nectary 2/3-3/4 as long as spur, very thin; lower petal prominently acuminate, crest small; inner petals 8-9 mm, claw slightly shorter than limb, dorsal crests rounded, clearly overtopping apex. Ovary with 13-15 ovules; stigma with narrow median sinus closely flanked by a long stipitate papilla on each side; basal lobes very prominent. Fruit and seeds unknown. Fl. Aug.
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