光杆轮伞莎草（学名：Cyperus alternifolius）为莎草科莎草属下的一个种。

Cyperus involucratis, with the common names of umbrella papyrus, umbrella sedge or umbrella palm, is a grass-like plant in the very large genus Cyperus of the sedge family, Cyperaceae.

The plant is native to Madagascar, one of the western Indian Ocean islands.