Calystegia soldanella

Glabrous perennial with trailing or rarely twining stems. Leaves more or less reniform, 1.5–4 cm long, 2–6 cm wide, somewhat fleshy, apex rounded to emarginate, often mucronate, base cordate, margins undulate; petiole 1–6 cm long. Flowers with peduncles 1.5–7 cm long, as long as or longer than petioles; bracteoles broad-ovate, 1–1.5 cm long, apex obtuse or rounded, slightly shorter than the calyx; sepals 0.8–1.6 cm long; corolla 3–5 cm long, white, pink or purplish. Capsule ovoid, 12–15 mm long, acute. Flowers spring and summer.