Plectranthus grandidentatus flowers

The flowers of Plectranthus grandidentatus are borne in long stem tip inflorescences. Flowers cluster in sessile cymes on the long stalk that sometimes grows a couple of side branches. The corollas are usually white, occasionally mauve. The flower tube bends down slightly, widening a little to the mouth where the large lobe of the lower lip spreads.

The plant has a long flowering season that peaks in autumn, flowerless only in spring (JSTOR; www.plantzafrica.com).