Plants (8–)12–60 cm, annual or biennial. Taproot slender. Stem often tinged purple, 1–2-branched above, base without fibrous remnant sheaths. Basal leaf blades linear 7–15 × 0.1–0.3 cm, base tapering into petiole, 5–7-nerved. Cauline leaves narrowly lanceolate, clasping, apical leaf ovate. Umbels 2–11 cm across; bracts 2–5, ovate, 3–30 × 2–12 mm, very unequal; rays 4–11, 0.5–10 cm, very unequal, slender; bracteoles 5(–7), broadly elliptic or obovate, green, 4–9 × 1.5–5 mm, apex acute, apiculate, exceeding flowers and fruit; umbellules 6–15 mm across, 16–24-flowered; pedicels 2–3 mm. Petals yellow, abaxially purplish. Stylopodium low-conic, discoid, purple. Fruit ovoid-oblong, purplish-brown, ca. 3 × 2 mm; ribs prominent; mericarp pentagonal in cross section; vittae 3–4(–5) in each furrow, 4 on commissure. Fl. and fr. Jul–Sep. 2n = 16*.
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