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DescriptionHerb or shrub to 2 m, sometimes tinged purple or violet. Stems glabrous or sparsely pubescent, not viscid. Leaves petiolate; lamina 4-24 cm, ovate, entire to somewhat lobed; base often markedly asymmetric. Flowers solitary, rarely paid, erect at first, drooping later. Corolla 12-19 cm, showy, white, yellow, purple or violet, trumpet-shaped, single, double or even triple. Fruit somewhat upright to nodding, irregularly breaking up when ripe, covered with stout conical spines or tubercles. Seeds whitish to brown.