Herbs, 20-40 cm tall. Tuber subglobose, 3-5 cm in diam., sometimes to 8 cm; section of tuber yellow. Stem erect or decumbent, usually black-purple, glabrous, but slightly pruinose. Leaf terminal, 2-3 × ternately compound, 6-10 × 9-18 cm; pinnules adaxially pale green, obovate or ovate-oblong, 2.5-3.5 × 1.5-2.5 cm, abaxially slightly glaucous, 2-or 3-parted, margin entire. Raceme terminal, 13-16-flowered, 13-25 cm; bracts triangular-ovate or reniform, apex acute. Pedicel 3-4 cm. Flowers yellow, 1.1-1.8 cm in diam. Sepals narrowly elliptic or oblong-obovate, 7-10 × 5-6 mm, apically obtuse. Petals ca. 2 mm. Stamens 4-7 mm. Pistil shortly stipitate; ovary rhomboid-ovoid; ovules 2 or 3; style short; stigma truncate. Capsule subglobose, 5-valved. Seeds greenish brown, obovoid. Fl. Mar-Apr, fr. Apr-May.
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