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Poa annua, or annual meadow grass (known in America more commonly as annual bluegrass or simply poa), is a widespread low-growing turfgrass in temperate climates. Notwithstanding the reference to annual plant in its name, perennial bio-types do exist. This grass originated as a hybrid between Poa supina and Poa infirma.Collins pocket guide Grasses, Sedges, Rushes and Ferns. Fitter.R, Fitter.A, Farrer.A. 1995. page 54 Major chromosomal rearrangements after polyploidy have contributed to variation in genome size in Poa annua.
The panicle is open and triangular shaped, long. The are stalked, awnless, long when flowering, and loosely arranged on delicate paired or spreading branches. Sometimes they are tinged purple.
The vivid green leaves are short and blunt at the tips, shaped like the prow of a small canoe. They are soft and drooping. Long sheaths clasp the stem. The leaves are smooth above and below, with finely serrated edges. Occasionally the leaves are serrated transversely.
The ligule is pointed and silvery, in comparison to common meadowgrass ( Poa pratensis), which has a squared ligule, and Poa trivialis, which has a pointed, but less silvery ligule.
The leaves are smooth above and below, with finely serrated edges. Occasionally the leaves are serrated transversely.
It is in flower all year around except for severe winters. The seeds ripen and are deposited 8 months of the year. The plant grows rapidly from seed, flowering within 6 weeks, seeding and then dying. BSBI Description retrieved 10 December 2010.
It has appeared on King George Island in the Antarctic South Shetland Islands as an invasive species, Antarctic ecology: Polar invaders, The Economist, Mar 6th 2012 as well as on Australia's subantarctic Heard and .
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