Onopordum acanthium
Tracheophyta
›Magnoliopsida›Asteraceae›Onopordum›Onopordum acanthium
Ecology
A tall biennial herb of fields, hedgerows, rubbish tips and other waste places, often near market gardens and farm buildings, and perhaps dispersed to new sites with manure or contaminated straw. 0-330 m (near Alston, Cumberland).
Status
Archaeophyte
Trends
There is archaeological evidence for the presence of O. acanthium in Britain from the Iron Age onwards. It appears to have increased in frequency since the 1962 Atlas, possibly as an escape from gardens where it is frequently grown for ornament.
World Distribution
As an archaeophyte O. acanthium has a Eurosiberian Temperate distribution; it is widely naturalised outside this range.
© G. Toone, IWNHAS
Bohemia Corner
© G. Toone, IWNHAS
Bohemia Corner
© G. Toone, IWNHAS
Bohemia Corner
© G. Toone, IWNHAS
Bohemia Corner
© G. Toone, IWNHAS
Bohemia Corner
© G. Toone, IWNHAS
Bohemia Corner
© G. Toone, IWNHAS
Bohemia Corner
© G. Toone, IWNHAS
Bohemia Corner
© G. Toone, IWNHAS
Bohemia Corner
© G. Toone, IWNHAS
Broad Habitats
Light (Ellenberg): 8
Moisture (Ellenberg): 4
Reaction (Ellenberg): 6
Nitrogen (Ellenberg): 7
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.7
July Mean Temperature (Celsius): 15.9
Annual Precipitation (mm): 733
Height (cm): 200
Perennation - primary
Perennial
Life Form - primary
Hemicryptophyte
Woodiness
Herbaceous
Clonality - primary
Little or no vegetative spread
Count of 10km squares in Great Britain: 778
Count of 10km squares in Ireland: 5
Count of 10km squares in the Channel Isles: 7
Atlas Change Index: 0.66
Weighted Changed Factor: 75
Weighted Change Factor Confidence (90%)
30
JNCC Designations
NBNSYS0000004499