Annual herb to 80 cm high, glabrous throughout. Leaves lanceolate to oblanceolate, (7–)30–120 x (1.5–)5–22 mm, attenuate-cuneate at the base, acute to subobtuse at the tip. Cymes usually many-flowered; peduncles 1(–2) mm long. Hypanthium campanulate, 1–1.2 mm long including shortly triangular sepals, sinuse-horns absent or minute. Petals absent (?always). Stamens 4. Style 0.1–0.3 mm long. Capsule globose, 1–2 mm in diam., slightly fleshy, exserted by a quarter to a half from hypanthium. Seeds as in A. auriculata.