Schoenus calceolus is a species of sedge endemic to limestone-derived soils in the Agulhas Plain region of South Africa.

[1] A unique diagnostic character of S. calceolus is the flat culm bases held together by a thin translucent sheath, which can sometimes be twisted.

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 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, the two groups are evolutionary distinct.