Poa compressa
Ecology
A rhizomatous perennial herb of rough or stony ground, cinders, dry grassy banks, waysides and walls. Some populations on rubbish tips and waste ground are probably introductions from wool shoddy and other sources. Generally lowland, but reaching 365 m at Mallerstang (Westmorland).
Status
Trends
There is no reliable information on trends in the distribution of P. compressa, and it is not possible to make a clear distinction between native and introduced populations, particularly in Scotland. It is regarded as alien in Ireland (Scannell & Synnott, 1987). The species is sometimes confused with other Poa species, particularly P. humilis, and is probably under-recorded.
World Distribution
European Temperate element; widely naturalised outside its native range.
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Broad Habitats
Light (Ellenberg): 9
Moisture (Ellenberg): 4
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 4
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.6
July Mean Temperature (Celsius): 15.6
Annual Precipitation (mm): 850
Height (cm): 50
Perennation - primary
Life Form - primary
Woodiness
Clonality - primary
Count of 10km squares in Great Britain: 1063
Count of 10km squares in Ireland: 0
Count of 10km squares in the Channel Isles: 2
Atlas Change Index: 0.21
Weighted Changed Factor: 17
Weighted Change Factor Confidence (90%)
JNCC Designations
Atlas text references
Atlas (381a)
.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.