A perennial, rather weak, branched, climbing herb, nearly glabrous throughout. Stems greenish-brown. Ocreae brown, papery, obliquely truncate, 4–6 (–8) mm. long. Leaves sagittate, the lower ones broadly ovate-triangular, up to 9.3 × 5 cm., acutely acuminate, the upper more lanceolate, sometimes narrowly so, up to 15 × 3.3 cm.; glabrous above, paler green and shortly and sparsely setose on the midrib and veins below. Petioles slender, variable in length, sometimes considerably exceeding the lamina. Inflorescence slender, branched, racemose, axillary and terminal; the flowers borne singly or in pairs, erect-spreading at first, later pendant. Bracts 1.5–2 mm. long, membranous, truncate, 0.5–2 cm. apart. Pedicels filiform, 2–3 mm. long. Tepals 5, yellowish, unequal, connate towards the base, 2.5–3.5 × 2–2.5 mm., obovate, terminally rounded, later ± appressed to the fruit. Anthers orange, ± rounded; filaments filiform, 1 mm. long. Ovary ovoid-ellipsoid, trigonous. Ripe fruit 6–8 × 4 mm., light orange-brown, shining, with two rows of purple setae up to 2 mm. long down the angles, each seta terminating in 2–4 reflexed, stellate barbs of unequal length, not exceeding 0.4 mm. long. Fig. 1/4–6, p. 2.
