Herbs, perennial, 10-15(-30) cm tall, glabrous. Tuber rounded, 1-2 cm in diam. Stems slender, weak, sharply geniculate at nodes, often branched from prophyll, usually with 2 leaves. Leaves long petiolate, biternate or nearly triternate with long petiolules; leaflets entire or deeply 3-divided, broadly to narrowly obovate to ovate-lanceolate, apex obtuse. Raceme laxly 3-10-flowered; bracts ovate to obovate, entire or usually flabellately divided, at fruiting ± enlarged. Pedicels 1-2(-2.5) cm, longer than bracts, slender. Flowers purple, ± curved. Sepals caducous, small or absent. Outer petals broad, flat, margin entire, apically with a smooth rounded emargination; spur upcurved, ± sigmoid, cylindric, 12-14 mm; nectary extended through 1/2-2/3 of spur, apex acuminate; lower petal straight or slightly saccate at base, 11-14 mm; inner petals 9-10 mm, with triangular dorsal crests clearly extending beyond apex. Capsule broadly lanceolate, together with style ca. 2 cm, 5-10-seeded. Seeds ca. 2 mm in diam., smooth. Fl. and fr. Apr-May.
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