Description. Erect (subsp. fistulosa) or climbing (subsp. carnea) undershrub to 4 m, often growing in clumps, stems stout, hollow, canescent when young, becoming glabrous. Leaves petiolate, 8 - 20 (- 30) x 3 - 10 (- 12) cm, ovate or elongate-ovate-deltoid, base cordate to subtruncate with rounded auricles, apex acuminate to long-acuminate, both surfaces grey-canescent when young, glabrescent, veins prominent abaxially; petioles 3 - 8 cm. Inflorescence of long-pedunculate axillary, somewhat compact cymes; peduncles 2 - 12 cm; bracteoles 3 - 4 mm, ovate or elliptic, caducous; secondary peduncles 3 - 7 mm; pedicels 5 - 15 mm, puberulent; sepals subequal, 5 - 6 x 7 - 8 mm, ovate to suborbicular, rounded, tomentellous, margins scarious; corolla 6 - 7 cm long, funnel-shaped, pink, tomentellous in bud, + / - glabrescent, limb 4.5 - 5 cm diam., shallowly lobed. Capsules 18 x 10 mm, ellipsoid, glabrous; seeds 10 - 11 x 3 - 4 mm, woolly with very long hairs on the angles.
Sumber: A foundation monograph of Ipomoea (Convolvulaceae) in the New World