Plants prostrate or climbing with tuberous roots, perennial. The stems usually somewhat succulent, glabrous or pubescent. Leaves variable, from cordate to ovate, entire, dentate or often deeply lobed, 5-10 cm long, glabrous or pubescent. Flowers absent in some varieties, frequent in others, in few-flowered cymes or sub-umbellate-cymose. Sepals oblong, the outer acuminate and cuspidate, (8-) 10-15 mm long, mostly pubescent or only ciliate. Corolla with a lavender to purple limb and darker throat, white in some varieties, 4-7 cm long. Fruits rarely formed, ovoid, glabrous.