1) Genus lolium 2) Liliopsid genus 3) Monocot genus 
(Rye Grass) This is a group, commonly known as Rye Grass, of annual and perennial Grasses that are used as 'nurse' grasses in lawn seed mixtures and as cover crops. L. perenne (English Rye Grass) is a perennial that can grow up to 2 feet high. The stem of this grass curves in and out and the flower clusters rest inside each curve.…
<botany> Common member of the gramineae family used as cattle fodder. It harbors several fungi and other parasites toxic to livestock and people and produces allergenic compounds, especially in its pollen. The most commonly seen varieties are l. Perenne, l. Multiflorum, and l. Rigidum. ... (12 Dec 1998) ... 
Lolium is a genus of grasses of the Hordeae tribe. The genus includes the Italian rye grass (Lolium italicum) and the darnel (Lolium temulentum).
[n] - darnel
genus Lolium noun darnel; ryegrass