Herbs, perennial, 10-30 cm tall, glabrous; stems and petioles of radical leaves attenuate to filiform underground base. Storage roots several, fascicled, spindle-shaped, sessile. Stems simple, with 1 leaf. Radical leaves few, with very long thin petiole; blade small, biternate, with long narrow leaflets. Cauline leaf sessile; blade lanceolate, 2-6 cm × 4-5 mm, entire. Raceme 2-3(-6) cm, sparsely 2-6(-10?)-flowered; bracts narrowly lanceolate to linear-lanceolate, 15-50 mm, entire. Pedicel 3-5 mm. Sepals white, margin lacerate. Petals pale yellow, with greenish keels and purplish veins, often turning purplish with age, especially at apex; upper petal 15-19 mm, petal lobes navicular-ovate, apex subacute, abaxial crest very narrow or absent; spur slightly attenuate, 7-11 mm; nectary ca. 2/3 as long as spur; lower petal navicular-oblanceolate, 9-11 mm; inner petals 8-9 mm. Stigma broad, bifid, with 8 papillae of which basal ones geminate; apical papillae rather long. Fruit linear, 19-22 × ca. 2 mm, 8-10-seeded; style ca. 2.5 mm. Fl. May-Jun [Jun-Jul in Nepal].
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