Perennial herb with erect stems up to 75 cm. tall, often much less, sometimes shortly decumbent below, terete, shortly pubescent, puberulous or glabrescent. Leaves sessile, ovate or ovate-lanceolate, those towards the middle of the stem ranging from 16 x 6 mm. to 55 x 23 mm., more or less acute at the apex, rounded or slightly cordate at the base, rather densely clothed with short or very short hairs or glabrescent, the pubescence shorter on the upper surface, furnished with inconspicuous translucent glandular dots and usually with black submarginal glands, especially near the apex, on the lower surface, sometimes the lower surface also has scattered black glands, sometimes these glands are entirely absent. Flowers many, rather loosely arranged in paniculate cymes. Bracts with black stalked glands on the margin, sometimes very dense towards the base, appearing to form a ring round the stem. Sepals ± equal, oblong-lanceolate, acute, with black stalked glands on the margin, with or without black glandular dots or dashes on the surface. Petals ± 13 mm. long, yellow often tinged red, with or without glandular dots. Stamens about 50, not arranged in definite groups. Styles 3. Capsule 3-valved.