Annual bluegrass contains both annual and perennial species. Annual bluegrass forms dense patches that can withstand low mowing heights. Annual bluegrass has a boat-shaped tip, folded in the bud. The ligule is membranous and auricles are absent.

Annual bluegrass has a small panicle seedhead. Germination occurs in late summer and early spring.

Annual Bluegrass is found throughout the United States and Canada.