Ammi majus

Erect to spreading herb, c. 60–120 cm high. Lamina of basal leaves 3–15 cm long; ultimate segments elliptic to obovate, 1–6 cm long, 2–20 mm wide, obtuse; upper stem leaves with linear to linear-lanceolate segments, margins toothed except for uppermost leaves; petioles shorter than lamina. Umbels 4–7 cm diam.; common peduncle to 20 cm long; rays 20–40, 2–7 cm long, arching; bracts to 5 cm long, usually 3-fid or pinnatisect or entire; umbellules mostly c. 10 mm diam., c. 20–many-flowered; pedicels to 10 mm long; bracteoles 1–8 mm long; broad and scarious at base, becoming narrow and acuminate. Petals white, c. 1.5 mm long. Fruit 1.5–2 mm long. Flowers mostly Nov.–Mar.