Poa annua (annual bluegrass) in a lawn. Photo by: Steve Dewey, Utah State University, Bugwood.org.

Poa annua plant. Photo by: Joseph M. DiTomaso, University of California – Davis, Bugwood.org.

Leaf tip of annual bluegrass plant. Note the canoe-shaped tip. Photo by: Joseph M. DiTomaso, University of California – Davis, Bugwood.org.

Annual bluegrass seeds. Photo by: Joseph M. DiTomaso, University of California – Davis, Bugwood.org.

Downy brome in daylily beds.

Downy brome in daylily beds.