Hibiscus calyphyllus, the lemon-yellow rose-mallow or in Afrikaans wildestokroos (wild hollyhock or literally, wild stick-rose), is a rounded shrub or slightly woody herb that branches, growing to 2 m.
The pale green, velvety leaves are large, heart-shaped or pointedly lobed. Their margins are irregularly toothed or scalloped.
The flowers grow solitary from leaf axils, lemon-yellow in colour with a maroon or almost black eye in the centre. The five petal tips are rounded, slightly creased, spreading to a diameter of 10 cm to 12 cm. There is a collar or epicalyx of five narrow bracts around the flower base, the sepals joined at the base, forming a cup. Many stamens with globular anthers spread around the staminal column above the dark corolla base. The style above the stamens is branched with five dark, disc-shaped stigmas.
The fruit is a papery capsule, the seeds velvety or smooth (Manning, 2009; www.plantzafrica.com).