Arctium lappa
Ecology
A monocarpic perennial herb of streamsides and river banks, roadside verges, tracks and waysides, field-borders, waste land and other disturbed places. Lowland.
Status
Trends
A. lappa was probably over-recorded in the 1962 Atlas because `Arctium lappa` was used as the name of the Arctium aggregate at that time. The distribution seems stable. It may only be a recent colonist outside its core area in England, and may be increasing.
World Distribution
As an archaeophyte A. lappa has a Eurosiberian Temperate distribution, but it is widely naturalised so that its distribution is now Circumpolar Temperate.
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Broad Habitats
Light (Ellenberg): 9
Moisture (Ellenberg): 5
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 9
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.8
July Mean Temperature (Celsius): 16
Annual Precipitation (mm): 769
Height (cm): 150
Perennation - primary
Life Form - primary
Woodiness
Clonality - primary
Count of 10km squares in Great Britain: 971
Count of 10km squares in Ireland: 4
Count of 10km squares in the Channel Isles: 1
Atlas Change Index: 0.51
Weighted Changed Factor: 7
Weighted Change Factor Confidence (90%)
JNCC Designations
Atlas text references
Atlas (287a)
.
1980. The biology of Canadian weeds. 38. Arctium minus (Hill) Bernh. and A. lappa L. Canadian Journal of Plant Science. 60:621-634.
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1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
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1992. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 3. 2 vols.
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1960. Report on the survey of Arctium L. agg. in Britain, 1959. Proceedings of the Botanical Society of the British Isles. 4:33-37.