Climbers, glabrous or sparsely pubescent. Leaf blade narrowly ovate to elliptic-ovate, (4.4-)8-14.2 ´ (1.9-)4.1-9.2 cm, abaxially glabrous to sparsely velutinous, especially along veins, adaxially glabrous, base rounded to emarginate, rarely truncate to shallowly cordate, apex attenuate-acuminate to apiculate. Corolla violet, dark blue, or purple, with a white throat (rarely rose-pink); tube 6-9(-10) mm; limb 1-2(-2.7) cm in diam., subentire to 5-lobed. Stamens ± exserted, equal or unequal, 7-12 mm. Disc 5-lobulate or absent. Fl. Apr-Oct, fr. Jun-Dec.
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