4 species
1 subspecies and varieties
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Lolium multiflorumannual ryegrass, Italian ryegrass, perennial ryegrass
Distribution: Introduced and well established in much of temperate North America.
Habitat: Roadsides and waste ground.
Origin: Introduced
Flowers: May - July
Lolium perenneEnglish ryegrass, perennial ryegrass
Distribution: Commonly cultivated as a forage plant; escaped and well established in the Pacific Northwest.
Habitat: Old fields, roadsides, and waste places.
Origin: Introduced
Flowers: May - July
Lolium persicumPersian ryegrass
Lolium temulentumdarnel, tare
Origin: Introduced
Flowers: May - June
ssp. temulentum – darnel