Schoenus crassiculmis is a species of sedge endemic to the mountains of the Western Cape Province of South Africa.

[1] Other important characters are its basal leaves that are reduced in length and the relatively short lower glumes of its spikelets.

[1] In the field, Schoenus auritus also appears semi-succulent, but that species generally has longer leaves (usually half the length of the flowering stems).

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

[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.