Clerodendrum glabrum var. glabrum flowers grow in congested terminal and axillary heads, from 3 cm to 14 cm in diameter. The white or pinkish flower is thinly tubular with four or five, spreading, pointed corolla lobes. The tube varies in length from 4 mm to 10 mm, the lobes up to 4 mm long.
The cluster in picture has many creamy buds, pointed from the furl of the closed corollas. The open flowers have tall stamens on straight or curved filaments, tipped with purple-brown anthers. Clerodendrum filaments are often long-exserted.
While the crushed leaves exude an unpleasant smell, the flowers vary: they may have either an alluring verbena-like fragrance or… also an unpleasant smell. Flowering happens from summer to early winter (Coates Palgrave, 2002; Pooley, 1993; Leistner (ed.), 2000; www.plantzafrica.com).