- spike rush - a sedge of the genus Eleocharis
--1 is a kind of sedge
--1 is a member of Eleocharis, genus Eleocharis
--1 has particulars:water chestnut, Chinese water chestnut, Eleocharis dulcis; needle spike rush, needle rush, slender spike rush, hair grass, Eleocharis acicularis; creeping spike rush, Eleocharis palustris