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Erect perennial with single stems to 60 cm tall from creeping rhizome; young stems pilose or sparsely so with broad curly glossy glandular hairs to 2 mm long. Leaves with petiole 5–25 mm long; lamina ovate or broadly so, largest 4–7.5≈2.2–4.2 cm, apex acute, base cuneate to truncate (rarely subcordate), pubescent to pilose or sparsely so. Flowers solitary or in 2-flowered axillary cymes; peduncle in cymes 3–7 mm long; pedicels 1–3 mm long, glabrous to pilose; bracteoles (bracts in cymes) ovate-elliptic or narrowly so, 11–27≈3–12 mm. Calyx 5–7 mm long, divided to (1–)2–3 mm from base, glabrous or lobes with scattered pilose hairs; lobes narrowly triangular. Corolla open during the day, mauve; tube 16–23 mm long of which the basal cylindric part 6–8 mm and the throat 8–13 mm long; lobes 8–12≈6–11 mm, ovate-elliptic with entire to slightly crenate margin. Stamens included in throat, didynamous, anthers not overlapping; filaments fused for 1–2 mm at base, free parts 2–3 and 5–8 mm long; anthers 1.5–2 mm long. Ovary glabrous; ventral stigma lobe 1–1.5≈0.5–1 mm. Capsule clavate, glabrous, 13–18 mm long, 8–14-seeded. Seed ellipsoid to circular, brown, 3–3.5≈2.5–3.5 mm.