Erect or straggling perennial herb from creeping woody rootstock; stems to 1 m long, quadrangular, glabrous to puberulous (rarely pubescent), with conspicuous bands of glossy setose hairs at nodes. Leaves thin, glossy, palmately veined; petiole 1–10 cm long, puberulous and distinctly ciliate; lamina ovate or broadly so (rarely oblong-lanceolate), largest (4–)6–14(–16.5)≈(2.3–)3–7.5(–10.5) cm, apex acute to acuminate (rarely obtuse), apiculate, base subcordate to deeply cordate with rounded to hastate lobes, margin entire to crenate (rarely sharply dentate), glabrous to puberulous, mainly on veins or with longer glossy setose hairs on veins. Flowers solitary (rarely paired or very rarely in 3’s); pedicels 2–6(–7) cm long, glabrous (rarely sparsely puberulous near apex); bracteoles green, with conspicuous raised dark green reticulation, lanceolate- or ovate-oblong, 1–1.9≈0.4–0.8(–1) cm, acute, with sparse to dense long (to 2 mm) glossy glandular hairs on veins and margins, more rarely glabrous. Calyx minutely puberulous, 1–3(–5 in fruit) mm high of which the broadly triangular lobes about half. Corolla white with yellow throat, more rarely pale lilac; tube 2–3.2 cm long; lobes 1–1.5(–2)≈1.5–2(–2.5) cm. Filaments 7–9 mm long, basal part glandular; anthers 2–2.5 mm long. Style with scattered glands. Capsule 8–9 mm in diameter, beak 14–16 mm, long. Seed reddish brown, ± 6 mm in diameter, reticulate to spinulose near apex.