Herbs, perennial, glabrous. Tuber rounded, 1-1.5 cm. Stem suberect to erect, 15-25 cm, 2-leaved. Leaves biternate, green, soft, delicate; leaflets stalked, orbicular to obovate, entire to sparingly crenate-dentate, sometimes more deeply divided. Raceme 3-10-flowered; bracts orbicular, or upper ones broadly lanceolate, margin entire or often apically crenate-dentate, much shorter than pedicels. Pedicels 10-18 mm, in fruiting stage to 25 mm. Sepals minute. Corolla blue with white center, with an inflated look, very broad, strongly fragrant; spur of upper petal broad, 10-12 mm, with acute nectary less than 1/3 as long as spur; lower petal with broadly saccate claw and shallowly emarginate entire limb 12-14 mm wide; inner petals 10-13 mm; dorsal crests narrow, not overtopping apex. Fruit elliptic, 10-15 × 5-6 mm, 4-9-seeded. Seeds ca. 1.8 mm, with a botryoid elaiosome. Fl. and fr. Apr-May.
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