A fast growing, creeping or twining, perennial vine with ribbed stems 3-6 m long. Leaves opposite, cordate or triangular-ovate, blade 3 to 12 cm long, 2 to 6 cm wide, on a slender petiole 1 to 8 cm long, base broadly cordate, tip acuminate, margins crenate, dentate, or entire, surfaces nearly glabrous, three- to seven-veined from base. Flowers in small heads in open, nearly flat-topped (corymbose) panicles; axillary and terminal heads 6 to 9 mm long, four-flowered; involucral bracts four, obtuse or acute, 5 to 6 mm long, glabrous or subglabrous with one additional smaller bract about 3 mm long; corolla white or yellowish white, about 5 mm long; anthers bluish gray or grayish black; style white. Fruit an achene, linear-oblong, 2 to 3 mm long, five angled, blackish brown, glandular; pappus of 40 to 45 bristles, about 4 mm long, white at first, reddish afterwards. |