Calystegia R.Br.

Bracteoles 2, enlarged, enclosing the calyx. Capsule 1 or incompletely 2-locular Calystegia
Leaves reniform or rounded-cordate, 2–5 cm wide, glabrous. Corolla purplish, 30–50 mm long. Stems trailing or slightly twining. Coastal sand dunes. Fl. spring–summer Calystegia soldanella