Herbs, ca. 40 cm tall. Rhizome shortly creeping, 3-5 mm in diam. Leaves basal and cauline, trifoliolate; leaflets abaxially glaucescent, adaxially deep green, oblong-elliptic or narrowly ovate, 10-13 × ca. 6 cm, leathery, abaxially papillose and sparsely pubescent or nearly glabrous, adaxially glabrous, base deeply cordate, terminal leaflet with equal rounded lobes, lateral leaflets conspicuously oblique with outer lobe large, deltoid, and acute or rounded, inner lobe smaller and rounded, margin closely spinulose-subserrulate, apex acuminate. Flowering stem with 2 trifoliolate opposite leaves. Panicle loosely 10-20-flowered, nearly glabrous, with lower peduncles 2-or 3-flowered. Pedicel 1-2 cm, sparsely glandular pubescent. Flowers yellow, ca. 3.5 cm in diam. Outer sepals oblong-elliptic, ca. 4 × 2 mm, apex obtuse; inner sepals broadly elliptic, 5-6 × 3-4 mm, apically obtuse. Petals nearly cylindric and horizontally spreading, much longer than inner sepals, with distinct petaloid rounded lamina forming a cup ca. 8 mm deep and fairly stout; spurs straight, 1.5-1.8 cm, blunt. Stamens ca. 4 mm; filaments ca. 1 mm; anther ca. 3 mm, valved, revolute. Capsules narrowly ellipsoid, ca. 1.3 cm; style 2-3 mm, rostrate. Fl. Mar-Apr, fr. Apr-Jun.
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