Hairless evergreen perennial HERB to about 0.5 m tall with woody stems. LEAVES alternate, more or less elliptic, mostly 1-2 cm long, to 0.5 cm wide, long-pointed, grey-green. FLOWERS in flat-topped clusters, greenish white, rarely yellow; spring to summer. Syn. S. altissimum Poiret, S. nicaeense Allioni.
The flat-topped, linear-elliptic or oblong-elliptic leaves and the pale flowers distinguish this species from the similar S. forsterianum Smith and S. rupestre L. which have bright yellow flowers and linear cylindrical leaves. Further, the inflorescence does not droop in bud as it does in S. forsterianum and S. rupestre.
Source: (2002). Crassulaceae. In: . Horticultural Flora of South-eastern Australia. Volume 3. Flowering plants. Dicotyledons. Part 2. The identification of garden and cultivated plants. University of New South Wales Press.