Crassula cotyledonis produces small, creamy white to dull yellow flowers in rounded, compact, thyrse-shaped clusters. They are spaced up a sometimes-branching inflorescence that grows tall (20 cm to 30 cm) and erect from a stem tip. The species is variable. Small bracts subtend the opposite branches of the inflorescence; and there are more of them below the flowers.
This plant was flowering in January in Meiringspoort (Frandsen 2017; Vlok and Schutte-Vlok, 2010).