Erect or straggling perennial or shrubby herb from creeping rootstock with fleshy roots; stems to 1.5 m long, quadrangular, glabrous to puberulous, with or without conspicuous bands of glossy setose hairs at nodes. Leaves thin, glossy, palmately veined; petiole (0.5–)1–13 cm long on vegetative leaves, glabrous to puberulous, distinctly ciliate or not; lamina ovate to cordiform or broadly so, largest (5–)6.5–17≈(3–)4.5–10 cm, apex acute to acuminate (rarely obtuse), apiculate, base subcordate to deeply cordate with rounded, hastate or sagittate lobes (rarely truncate), margin entire to grossly and irregularly dentate, glabrous to puberulous, often only on veins, rarely with longer glossy setose hairs. Flowers solitary (rarely paired) or from lower axils in racemes with small ovate sessile bracts; pedicels 1.5–5(–10 in fruit) cm long in solitary flowers and 0.5–2(–5 in fruit) cm in racemes, glabrous to puberulous (rarely with a few long glossy glandular hairs); bracteoles green, with conspicuous raised dark green reticulation, ovate-oblong, 0.9–2.2≈0.4–1.2 cm, acute, with sparse to dense long (to 1.5 mm) glossy glandular hairs on veins and margins. Calyx glabrous or minutely puberulous, 1–2(–5 in fruit) mm high of which the broadly triangular lobes about half. Corolla limb and upper part of tube dark bluish purple or royal blue, lower part of tube white, throat yellow; tube (3.2–)3.5–5 cm long; lobes 1–1.8≈1.5–2.5 cm. Filaments 9–13 mm long, glabrous; anthers 2–2.5 mm long. Style with scattered glands. Capsule 8–13 mm in diameter, beak 13–18 mm, long. Seed dark reddish brown, ± 5 mm in diameter, reticulate to spinulose near apex.