Shrub or tree to 12 m.
Flowers large, solitary in the leaf axils, pedicels about 2.5-16 cm long. Epicalyx segments 3, falling very early in bud. Calyx +/- cupular with minute teeth, but spreading as the flower develops. Corolla large, about 6-7 cm long, mainly yellow (red towards the base) but turning pink or red throughout following anthesis. Stamens fused to form a central column, anthers horseshoe-shaped. Ovules 4 per locule.
Seed germination time 11 days. Cotyledons transversely elliptic to broadly cuneate or obtriangular, about 17 x 29 mm, 5-veined, numerous dark red glands visible with a lens. At the tenth leaf stage: leaves cordate, apex acuminate, base truncate to shallowly cordate, leaf blade with a scattered reddish scales on the each surface; numerous oil glands visible with a lens; petiole, stem and terminal bud clothed in round or stellate reddish scales; stipules linear, about 2 mm long.