An erect annual of cultivated ground, disturbed areas and paths, in shaded or semi-shaded situations. It spreads by seed or occasionally by underground rhizomes. Seed is freely set by self-pollination, and forcibly ejected from the capsules over a distance of up to two metres. Lowland.
O. stricta was cultivated in Britain by 1658 and has long been frequent in S. England; it was recorded from the wild by 1823. It has spread westwards since the 1962 Atlas. Most populations are casual, but is has been known to persist for many years in some places.
Native of N. America and E. Asia; extensively naturalised in temperate Europe.
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Light (Ellenberg): 6
Moisture (Ellenberg): 5
Reaction (Ellenberg): 6
Nitrogen (Ellenberg): 5
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.8
July Mean Temperature (Celsius): 15.7
Annual Precipitation (mm): 895
Height (cm): 40
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 396
Count of 10km squares in Ireland: 27
Count of 10km squares in the Channel Isles: 4
Atlas Change Index: -0.09
Atlas text references
1985. Biology of Canadian weeds. 71. Oxalis stricta L., O. corniculata L., O. dillenii Jacq. ssp. dillenii and O. dillenii Jacq. ssp. filipes (Small) Eiten. Canadian Journal of Plant Science. 65:691-709.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
1978. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 2. 2 vols.
1998. Plant crib 1998.
1958. Oxalis in the British Isles. Watsonia. 4:51-69.