The semi-succulent growth form of Schoenus crassiculmis partially resembles that of S. auritus, but the former species does not have membranaceous leaf sheaths, and its spikelets are narrower with relatively shorter lower glumes.

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

[1] Other notable genera in tribe Schoeneae include Lepidosperma, Oreobolus, Costularia, Tetraria and Gahnia.

[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.

[1] Most reports of this species are from coarse soils, but it appears to occasionally occur in wet habitats such as seepages and streamsides.