annual bluegrass

Poa annua L.

Appearance: Poa annua is an erect or clump-forming annual grass that tolerates close mowing, or may reach 11 in. (27.9 cm) in height. It can also be identified by having light green grass with a boat-shaped leaf tip that resembles other lawn and turf grass species. This weed is very similar to Kentucky Bluegrass (Poa pratensis), but is much lighter in color and lacks rhizomes.
Foliage: Leaves are light green in color, especially when compared to the dark green color of other closely related turfgrass species (for example Kentucky Bluegrass, Poa pratensis). Leaf blades are 0.5-5 in. (1.3–12.7 cm) long, 0.04-0.2 in. (1-5 mm) wide, folded in the bud and lack hairs on either surface.
Flowers: The seed head is an open panicle, 0.75-2.5 in. (1.9-6.4 cm) long, and pyramidal in outline.
Fruit: Fruit is an achene.
Ecological Threat: Poa annua is primarily a weed of lawns and turfgrass, found throughout the United States.

Flower(s)
Steve Dewey, Utah State University, Bugwood.org
Additional Resolutions & Image Usage

Flower(s) inflorescence.
Joseph M. DiTomaso, University of California - Davis, Bugwood.org
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Seed(s)
Bruce Ackley, The Ohio State University, Bugwood.org
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Feature(s) Magnified ligule
Bruce Ackley, The Ohio State University, Bugwood.org
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