Chenopodium album or Fat Hen, is an erect annual herb to 3 (but rarely above 1.2) m high. Stems ribbed, often tinged with purple or red. Leaves alternate, ovate to rhombic becoming more linear up stem, 2–8 cm long, 0.5–5 cm wide, margins entire to variously toothed, at least lower leaves with leaf stalks. Seed round, flattened with a marginal notch, brownish green to black, 1–1.3 mm wide. Seed falling enclosed within fruit.