Lepidosperma oldfieldii is a sedge (in the family Cyperaceae) that is native to Tasmania.[1] It was first described in 1860 by Joseph Hooker.
Hooker says of the species that it is similar to L. elatius, but smaller and more slender "with a different panicle, which is very long (6-18 inches), and .... covered with fascicled chesnut-brown spikelets. ... The spikelets have a subsquarrose appearance. The edges of the culms are very scabrous, and cut severely."