Perennial or annual herb 0.2-0.7(-0.8) m tall, erect, unbranched below inflorescence or occasionally with 1-2 flowering branches from upper stem nodes. Stems green, 4-lined, sparsely (?) gland-dotted, scabrous-tomentose to pilose; internodes 5-20 mm long, lower equalling leaves, upper longer than them. Leaves sessile, appressed to ascending, spreading when fading; lamina 4-15 x (1.5)2-7 mm, narrowly ovate or lanceolate to narrowly oblong-elliptic (or lower sometimes oblanceolate), margin recurved, concolorous, not glaucous, subcoriaceous, scabrous-tomentose to pilose; apex acute to obtuse, base rounded-subamplexicaul to parallel- sided, not decurrent, free; basal vein(s) l(-5), midrib without or with 1 pair of branches, tertiary reticulation not visible; laminar glands dense, slightly prominent beneath. Inflorescence up to c. 30-flowered (terminal), monochasial after 1st or 2nd grade, sometimes with up to 15-flowered dichasial/monochasial or usually wholly monochasial branches from up to 5 lower nodes, occasionally with 1-2 pairs of subsidiary flowering branches below, the whole cylindric to subcorymbiform; pedicels 1.5-2 mm long; bracts 2 mm long, lanceolate, setulose-ciliate. Flowers c. 5-11 mm in diam., stellate. Sepals (2.5-)3-5 x 1.5-2.5 mm, subequal, ovate to ovate-lanceolate or obovate, acute; veins 5-7, unbranched, only midrib or all veins slightly prominent, but less so than glands; glands linear, distally punctiform; margin setulose-ciliate, lamina sparsely setulose to glabrous. Petals (deep ?) yellow, 4-7 x 4-7 mm, 1.5-2 x sepals, obovate; apiculus acute; glands linear, interrupted distally. Stamens (15) 20-40, almost free, longest 2.5-3 mm long, 0.65-0.75 x petals. Ovary c. 1.5 x 0.8 mm narrowly ovoid-ellipsoid; styles 3(4), 1.5-2 mm long, 1-1.3 x ovary, outcurving; stigmas broadly capitate. Capsule (3.5-)4-5 x 2-3 mm, ovoid to ellipsoid-subglobose, equalling or slightly exceeding sepals. Seeds 0.4-0.6 mm long, ecarinate; testa linear-reticulate.