This is one of the larger species, growing upwards to 30
inches. It is a perennial with very thin rhizomes, forming mats.
The upper part of the leaf sheath is thin, very loose, and transparent.
The spikelets are about 1 inch long. Its preferred habitat is
swales, sloughs, ditches, pond margins, and the edge of slow
moving streams. Distribution is throughout the Escambia region.
The olivacea is distinguished from other rush by
having olive-green to dark brown achenes. The fruit bundle is
tubercle on the end of the stems; conic and about as wide as
Related species in the Escambia region are Hairgrass, E.
baldwinii, Viviparous Spikerush, E. vivipara,
Jointed Spikerush, E. equisetoides, Annual Spikerush,
E. atropurpurea, and Square-stem Spikerush, E. quadrangulata.