Crassula rupestris flowers grow in densely branched heads on distinct stem-tip stalks. A flower becomes 3 mm to 4 mm long. It has a superior ovary divided into five separate carpels. The five petal lobes curve outwards, while the five stamens initially lean inwards, later also arching out, presenting their dark, triangular anthers to be touched by all.
A white stigma, less easy to see and therefore harder to miss physically if you are a visiting insect, arises centrally above the ovary. The fleshy sepals around the base of each corolla resemble the brick-red flower stalk colour, while inside the corolla there is some pink below the nearly white corolla tips (Manning, 2009; Vlok and Schutte-Vlok, 2010).