Monday, March 29, 2010

Rough Bluegrass. Cool Season Grasses

Poa trivialis (Rough bluegrass; UK: Rough-stalked meadow-grass), is a perennial plant, and is regarded in the USA as an ornamental plant and is of the Poa family. It is very common in meadows and pastures throughout Britain. Its preferred habitat is moist, sheltered places. Its herbage is herbage is plentiful and fairly nutritious - not as much as Poa annua or Poa pratensis. It is useful for grazing on heavy and damp soil. It also copes well with the polluted atmosphere of towns and cities. It is in flower from June onwards thoughout the summer.

Though often considered a weed of golf courses, some use it as a turits lighter green color. It is an invasive species in the Great Lakes region and was first sited in 184. It has short stolons. The leaves are broad and tapering, and the sheathes are very rough. They have pointed ligules 4-10mm long. Compare to Annual Meadow grass Poa annua which is silvery and pointed, and Common Meadow grass Poa pratensis which is short and blunt.

The roughish, slender stem grows 30 to 60 cm high. Compare with smooth meadow grass Poa annua which has a smooth stem. The panicle is green and 15 cm long. The spikelets are egg-shaped.
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