Plants 15–30 cm, not onion-scented. Stem slender, slightly flexuose, densely hirsute, corymbose-branched, branches alternate. Basal leaves subsessile or sessile; leaf blade rhombic, 2–3-pinnatisect, ultimate segments gray-green, elliptic, ca. 2 cm, densely pubescent on both surfaces, 3–5-lobed, lobules triangular, deciduous. Uppermost leaves often bladeless, petioles sheathing throughout. Compound umbels terminal on stem and branches; umbels 4–6 cm across; rays 6–12, subequal; bracteoles lanceolate, densely white pubescent, persistent; umbellules 1–25-flowered. Petals abaxially puberulous. Stylopodium low-conic, base dilated, undulate-margined. Fruit ellipsoid, 5–8 × ca. 3 mm; lateral ribs narrowly winged, wings grayish white; vittae large, 1 in each furrow, 2 on commissure. Fl. and fr. May–Jun.
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