Isolepis crassiuscula is a species of flowering plant in the sedge family. It is native to Australasia and Japan.Muasya, A.M., Simpson, D.A. 2002. A monograph of the genus Isolepis R. Br. (Cyperaceae). Kew Bull. 57: 257–362. It was first described by the botanist Joseph Dalton Hooker in 1859.

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