Isolepis prolifera is a species of flowering plant in the family Cyperaceae that grows in temperate regions of the Southern Hemisphere.

Isolepis prolifera has a caespitose (tufted) growth form, with round stems up to 90 centimetres (35 in) tall and 4 millimetres (0.16 in) wide.

[3] Its leaves are reduced to red or brown sheaths around the stem, sometimes with a small free lobe up to 3 mm (0.12 in) long.

[5] Isolepis prolifera was first described by Christen Friis Rottbøll, a pupil of Carl Linnaeus, in his 1772 work Descriptiones plantarum rariorum, as "Scirpus prolifer".

In South Africa, it is known as vleigras in Afrikaans or incapha in Zulu, in Australia as "budding club-rush",[8] and in the United States as "proliferating bulrush".