Herbs, perennial, 20-45 cm tall, glabrous to usually finely papillose-hairy; stems and petioles of radical leaves attenuate to filiform underground base. Storage roots densely fascicled, spindle-shaped, 10-15 × 2-4 mm, sessile. Stems suberect, very slender, with 2 or 3 leaves in upper 1/3. Radical leaves not seen. Cauline leaves: petiole 1-4 cm; blade glaucous adaxially and more so abaxially, thin, ternate to pinnate with 1 or 2 pairs of entire or deeply 2-or 3-fid pinnae, often decurrent on petiole; lobes linear-oblong to lanceolate, 3-5 × 0.3-0.9 cm. Racemes 10-20-flowered; bracts sharply reflexed in fruit, 7-15(-20) mm with distinct petiole 2-3 mm, lower broadly rhombic-acuminate, upper narrowly oblanceolate, entire or lower with 1 or 2 coarse teeth. Pedicel ca. 5 mm, to 10 mm and reflexed in fruit. Sepals minute or lacking. Corolla pure yellow, sometimes with darker veins, apex of outer petals greenish; outer petals broadly spreading at base, abruptly narrowed to acute apex, with ca. 2 mm wide, obtuse, entire or slightly dentate crest overtopping apex; upper petal 17-18 mm; spur slightly downcurved, ca. 8 mm, thin, tapering; nectary very thin, ca. 1/2 as long as spur; lower petal broadly saccate in lower 1/3, limb reflexed; inner petals 8-9 mm. Stigma with marginal papillae: median 2 distinct, lateral broad and indistinct; geminate papillae lateral (submarginal) and on basal lobes. Capsule oblong-obovoid, 11-12 × ca. 3 mm, ca. 14-seeded. Seeds (immature) ca. 1.2 mm; elaiosome small. Fl. Jun-Aug, fr. Aug.
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