Erect or spreading annual herb to 50 cm, grey-green, glabrous except for minute glandular hairs on young growing points; prickles to 2 cm long, scattered on most parts. Leaves ovate; lamina 3–7 cm long, 2.5–5 cm wide, concolorous, lobed; lobes triangular; petiole 10–25 mm long. Inflorescence short, 3–6–flowered; peduncle absent or to 5 mm long; pedicels c. 5 mm long. Calyx 3 mm long, frequently with 1 or 2 large prickles on outer side; lobes triangular, 1 mm long. Corolla campanulate, c. 10 mm diam., pale lavender. Anthers 1.5–2 mm long. Berry depressed globular, 10 mm diam., green, finally light brown, the skin brittle. Seeds 3–3.5 mm long, light brown, winged.