Rhizome creeping, branching; stems slender, branching, twining, glab., up to ± 2 m. long. Lvs on slender petioles up to c. 5 cm. long; lamina 2.5-7·5 cm. long, sagittate, acute to acuminate; basal lobes acute, divergent, often again toothed or lobed. Peduncles narrowly winged; bracts bluntly ovate, > subequal broad-ovate obtuse sepals. Corolla white, c. 12 mm. diam.; ovary imperfectly 2-loculed. Capsule globose, seeds us. 4.

2n = 22

Glabrous perennial with creeping rhizome and slender twining branches. Petioles slender, to c. 5 cm long. Lamina 2.5-8 × 1.5-4.5 cm, sagittate, narrowly to broadly triangular; apex acute to acuminate; basal lobes acute and sometimes toothed; basal sinus broad and rounded. Fls usually solitary; peduncles narrowly winged, usually 1-2.5 cm long. Bracts broad-ovate, obtuse, c. 1 cm long. Sepals broad-ovate, < bracts, obtuse. Corolla c. 15 × 12 mm, white, campanulate. Ovary imperfectly 2-locular. Capsule c. 6 mm diam., globose. Seeds black, reticulately ribbed.