Convolvulus soldanella Linnaeus, Sp. Pl. 1: 159. 1753; Calystegia reniformis R. Brown; C. soldanelloides Makino; Convolvulus asarifolius Salisbury; C. maritimus Lamarck; C. reniformis (R. Brown) Poiret.

Plants glabrous. Stems prostrate, to 1 m, scarcely twining or not. Petiole longer than leaf blade; leaf blade reniform, slightly fleshy, sinus divergent or shortly parallel sided, apex rounded to emarginate, sometimes mucronate. Lower peduncles usually exceeding leaves, upper peduncles often shorter; bracteoles ovate to nearly circular, usually shorter than calyx, apex obtuse or retuse. Corolla pink, 3--5(--5.5) cm. Stamens (1.8--)2.1--2.7(--3) cm; anthers (3--)4--5.5(--6) mm. Fl. May-Jul, fr. Jul-Sep. 2n = 22.

Sandy seashores, coastal dunes; sea level. Fujian, Hebei, Jiangsu, Liaoning, Shandong, Taiwan, Zhejiang [Japan (including Ryukyu Islands), Korea, Russia; Africa, Asia, Australia, Europe, North America, Pacific Islands, South America].