The Collaborative International Dictionary
Triodia seslerioides
Redtop \Red"top`\ (-t?p`), n. (Bot.) A kind of grass ( Agrostis vulgaris) highly valued in the United States for pasturage and hay for cattle; -- called also English grass, and in some localities herd's grass. See Illustration in Appendix. The tall redtop is Triodia seslerioides.