Densely papillate, few-branched perennial to 1.5 m. Leaves opposite, lanceolate to triangular, green to grey sometimes with purple blotches. Flowers in flat-topped, pedunculate clusters, tubular, white, pink or red, petals 3-6 mm long.
Perennials with erect branches up to 1.5 m long, little branched, covered with coarse, hard and often rounded papillae, with leaves not deciduous. Leaves lanceolate to triangular or oblong-falcate, 40-120(-150) x (8-)12-35(-40) mm, acute to obtuse, dorsiventrally compressed and concave above, convex below, or apparently laterally compressed and scarcely convex on both surfaces, densely covered with rounded to often irregularly shaped papillae, green to grey, sometimes with purple spots. Inflorescence a rounded flat-topped thyrse, with peduncle 30-100(-150) mm long. Calyx: lobes triangular, 1-3 mm long, acute, covered with spreading hairs and marginal cilia, fleshy, green. Corolla tubular, fused basally for 1-1.5 mm, white, pink to scarlet; lobes oblong-oblanceolate, 3-6 mm long, with apices recurved. Stamens with black anthers. Squamae transversely oblong, 0.2-0.4 x 0.5-0.6 mm, usually emarginate, slightly constricted downwards, fleshy, yellow.