Herbaceous vine, glabrate except for short pubescence on petioles and veins on upper surfaces of young leaves. Petioles to 5 cm long; blades ovate-cordate, gradually acuminate, cordate at base, 5-13 cm long, 2.5-7 cm wide, the lobes +/- sagittate. Flowers in axillary, corymbiform clusters; peduncles to 9 cm long, stout; pedicels less than 1 cm long; sepals glabrous, suborbicular, rounded at apex, the 2 outer ones 3-5 mm long, the 3 inner ones 5-10 mm long, the margin scarious, forming a submarginal apiculum; corolla funnelform, 5-8.5 cm long, lavender outside; dark red-violet inside; stamens of irregular lengths, 2-3 cm long at anthesis; filaments fused to lower 1 cm of tube and glandular-villous near base of free part; anthers introrse, to 4.5 mm long, shedding pollen in bud; style ca 2 cm long, held above anthers in bud but well below anthers at anthesis; stigma white, bilobed; nectary ringlike; nectar copious. Fruits not seen. Croat 7463. Mexico to Peru. In Panama, known from tropical moist forest in the Canal Zone and Panama and from premontane moist forest in Panama.