Erect to decumbent perennial herb to 50 cm tall with several stems from woody rootstock or erect to scrambling subshrub to 1.5 m tall; young stems subglabrous to densely puberulous, pubescent or pilose with broad glossy straight or curly spreading or upwardly directed non-glandular hairs. Leaves with petiole (0–)3–20(–30) mm long; lamina lanceolate to broadly ovate or broadly elliptic, largest (3–)4–10(–14)≈(0.5–)1–6(–7) cm, apex acute to rounded, base attenuate to truncate, subglabrous to pubescent, densest along veins. Flowers solitary or in 2–3-flowered axillary cymes; pedicels 1–2.5 mm long, glabrous to puberulous; bracteoles (bracts in cymes) lanceolate to broadly ovate, 7–23≈2–16 mm. Calyx (6–)9–23(–27) mm long, divided to 1–3 mm from base, with filiform pubescent- to pilose-ciliate lobes with hairs to 2 mm long, otherwise glabrous to puberulous. Corolla falling early in the morning, white to mauve or purple; tube 14–28 mm long of which the basal cylindric part 4–10 mm and the throat 11–21 mm; lobes 6–16≈5–14 mm, elliptic or broadly so with entire to crenate-dentate edge. Stamens included in throat, didynamous, anthers not or slightly overlapping; filaments fused for 1–2 mm at base, free parts 2–4 and 5–8 mm long; anthers 1.5–3 mm long. Ovary densely puberulous; ventral stigma lobe 1–2≈± 0.5 mm. Capsule narrowly oblanceolate to clavate, puberulous to sericeous (very rarely glabrous), (13–)15–24 mm long, (6–)8–16-seeded. Seed ovoid to orbicular, grey to brown, 3–4≈3–4 mm. Fig. 31, 10–11, p. 206.