Ryegrass (Lolium) is a genus of nine species of tufted grasses in the Pooideae subfamily of the Poaceae family. They are characterized by bunch-like growth habits. These plants are native to Europe, Asia and northern Africa, but are widely cultivated and naturalized elsewhere. Ryegrasses are naturally diploid, with 2n = 14, and are closely related... Found on http://en.wikipedia.org/wiki/Ryegrass
any of about 10 species constituting the genus Lolium (family Poaceae), which includes forage and lawn grasses of temperate Eurasia and the noxious ... Found on http://www.britannica.com/eb/a-z/r/82