Annual bluegrass

Annual bluegrass - Poa annua - plant

Annual bluegrass – Poa annua – plant

Annual bluegrass - Poa annua - seed head

Annual bluegrass – Poa annua – seed head

Annual bluegrass - Poa annua - seed head leaf tip

Annual bluegrass – Poa annua – seed head leaf tip

Annual bluegrass                                        
Poa annua L.
Poaceae (Grass family)
 
Life cycle
Clump-forming winter or summer annual.
 
Leaves
Hairless, soft, light green leaves are folded in the bud and lack auricles. Leaves have linear margins (sides parallel) and distinctive boat-shaped tips.
Ligule
Slightly pointed membranous ligule.
 
Stems
Upright, bending, up to 1-foot-tall stems are clump-forming, enlarge by tillering and may root at the lower nodes.