Simple or branched, decorative, densely leafy, shrubby perennial herbs, 0.8–3 m. high; stems subquadrangular, sulcate, thinly pubescent. Leaves subsessile or shortly petiolate, generally discolorous, narrowly oblong, oblong-lanceolate or rarely elliptic, 2–11 cm. long, 0.4–4 cm. broad, margins entire more or less inrolled and scabrid, upper surface glabrescent, lower surface white tomentose, more sparsely so on older leaves so that the glands are visible, cuneate at the base, truncate, rounded emarginate, subacute (rarely acute) and usually apiculate at the apex. Flowers pink, red, purple, or pale mauve with deeper markings. Calyx usually persistent; lobes lanceolate or ovate-lanceolate, 5–10 mm. long, about 2 mm. broad at the base, acute or acuminate at the apex, pubescent. Corolla large, 3.5–7 cm. long, 2–3 cm. in diameter at the throat, thinly to densely pubescent. Filaments arising from a band of hairs near the base of the tube; anthers narrowly oblong, 6 mm. long. Ovary densely white-appressed-pilose, apex emarginate. Capsule subquadrangular, 4-sulcate, 2–2.5 rarely 3 cm. long, 5–6 mm. broad, rather densely pubescent, becoming glabrescent, gradually narrowed into a flattened rather broad beak up to 5 mm. long. Seeds not winged, about 2 mm. long, 1.5 mm. broad, faintly rugose on the sides and faces.