Plants 50–80 cm. Taproots cylindric, to 18 cm. Stem solitary, rarely 2–5; base with papery remnant sheaths. Basal and lower leaves oblong-ovate in outline, 3–4-pinnate; ultimate segments linear, 2–5 × (0.3–)0.5–1 mm. Umbels 4–8 cm across; bracts 2–4, linear or linear-lanceolate, ca. 3 mm; rays 9–15, 1.5–5 cm, slightly unequal; bracteoles 5–8, lanceolate, ca. 1.5 × 0.3 mm; umbellules 10–30-flowered. Calyx teeth obsolete. Petals white, base not clawed. Fruit oblong-ellipsoid, 3–4 × 1.5–2 mm; vittae 1 in each furrow, 2 on commissure. Fl. May–Jul, fr. Aug–Oct. n = 11*.
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