Leaves sessile; lamina (15) 20–30 × 6–12 (17) mm., oblong-ovate to broadly ovate, rounded or retuse at the apex, rounded to cordate-amplexicaul at the base, with ± undulate margins, reticulate venation, numerous prominent yellowish translucent glandular dots, and intramarginal dark glandular dots.
Petals primrose-yellow, red-tinged or red-veined, with dark glandular marginal dots, and sometimes with short orange or reddish streaks dispersed over the lamina.
Stamens c. 80, irregularly arranged or in 3 indistinct groups, with filaments ± united at the base; anthers with a dark gland at the end of the connective.
Sepals lanceolate or linear, acute or acuminate, subequal, with longitudinal translucent glandular streaks or lines and marginal dark glandular dots.
Stems erect or somewhat ascending, usually branched above, terete, usually with cortex exfoliating, eglandular.
Slender or bushy shrub or perennial herb 0·3–1·5 m. high (or higher?).
Flowers numerous, in rather dense corymbose cymes.
Ovary 3-locular; styles 3, free, 3–4·5 mm. long.
Fruit capsular, 3-valved, erect.