Northern Prairie Wildlife Research Center
Annual Bluegrass (Poa annua)
- Family: Grass (Poaceae)
- Flowering: March-October.
- Field Marks: Bluegrasses have 2 or more flowers in a spikelet. Annual bluegrass is the only wetland Poa that lacks the tuft of cobwebby hairs at the base of the fertile scales. It is the first bluegrass to bloom in the spring.
- Habitat: Fallow fields and in most disturbed areas.
- Habit: Annual herbs with fibrous roots.
- Stems: Sprawling or occasionally erect, smooth, usually less than 8 inches long.
- Leaves: Up to 3 1/2 inches long, up to 1/10 inch broad, smooth.
- Flowers: 4-5 borne in spikelets up to 1/6 inch long, with several spikelets forming small panicles; each flower subtended by a scale that lacks a tuft of cobwebby hairs near its base.
- Stamens: 3.
- Pistils: Ovary superior.
- Grains: Yellow-brown, about 1/20 inch long.
Previous Species -- Common Reed (Phragmites australis)
Return to Species List -- Group 2
Next Species -- Canada Bluegrass (Poa compressa)