The golden yellow flowers of Rhigozum zambesiacum are sweetly fragrant for a short period. They grow solitary or in clusters at leaf axils, mostly triggered by rain. The calyx is bright green.
The corolla tube is 1 cm to 1,5 cm long, its lobes with crumpled or frilled margins spreading to a diameter of 3,5 cm. Flowering happens in spring and early summer.
The pale brown fruit is a flat, pod-like capsule, slender and thin-walled. It dehisces or splits when ripe, remaining on the plant for long afterwards. This fruit is about 4 cm long and 1,5 cm wide. The seeds have papery wing attachments (Coates Palgrave, 2002; Schmidt, et al, 2002; Van Wyk and Van Wyk, 1997; Pooley, 1993).