The Collaborative International Dictionary
Hare's-tail
Hare's-tail \Hare's"-tail`\ (-t[=a]l`), n. (Bot.) A kind of grass ( Eriophorum vaginatum). See Cotton grass, under Cotton.
Hare's-tail grass (Bot.), a species of grass ( Lagurus ovatus) whose head resembles a hare's tail.
Wiktionary
hare's-tail
n. (context botany English) A kind of grass ((taxlink Eriophorum vaginatum species noshow=1)).