[1] Finally, the overall growth form of S. crassus appears more stiff and rigid compared to the more lax-looking S. cuspidatus, which often has curled leaves.

It appears that part of this problem is caused by the tendency of the southern African Schoenus to form hybrids with each other.

[3][1] Southern African Schoenus were once classified as Tetraria; however, based on molecular and morphological differences, we now know that the two groups are evolutionary distinct.

[6] Schoenus crassus has been found growing in south-western South Africa, with its distribution extending from the Cape Peninsula in the west to the Langeberg Mountain range in the east.

[1] Based on collection data and field observations, it is a species that generally prefers sandstone-derived soils in the fynbos vegetation type.