High-climbing annual vine, normally glabrous, but pilose forms sometimes found. Leaves 3-7-lobed, green or somewhat glaucous especially below, 3-7 cm long, 3.5-8 cm broad, the lobes entire or lobulate, acute or rarely obtuse, sometimes mucronate, lanceolate or obovate; petioles 1-11 cm long. Flowers axillary, but often forming pseudo-racemes (rarely branched); peduncles longer than petioles; calyx with lobes of different form, the inferior two lobes broadly lanceolate, obtuse, 4 by 10 mm, the superior three lobes shorter, 4 by 6 mm, sub-acute, yellowish or greenish like the basal part of the spur; spur short, 8-10 mm long, stout, ending in a dark green or brownish hook; petals yellow, often purple-spotted along the nerves near the base, the superior petals large, 15-20 mm long, 12-17 mm broad, ovovate and long-unguiculate, the blade lobed, the lobes lanceolate, obtuse, not mucronate, the claw recurved or rarely straight with a big acute tooth at the bending, inferior petals almost elaminate, long-clawed, 8-10 mm long, with long purple ciliae. Fruitingl carpels 10-14 mm long, dark brown or blackish; carpophore short.
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A climbing annual plant. It grows 2.4 m high and spreads 2.4 m wide. The leaves are light green and have 5 lobes. The flowers are yellow and in clusters. They are on long stems and 25 mm wide. The smaller, lower petals have fringed margins.
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