Amsinckia micrantha

Tracheophyta MagnoliopsidaBoraginaceaeAmsinckiaAmsinckia micrantha


An annual weed of arable land and waste ground. It is sometimes an abundant or even pernicious weed on light, sandy soils. It arises as a contaminant of grain and from wool shoddy. Lowland.



World Distribution

Native of western N. America.

© K.J. Walker, BSBI

Broad Habitats

Arable and horticultural (includes orchards, excludes domestic gardens)

Light (Ellenberg): 9

Moisture (Ellenberg): 3

Reaction (Ellenberg): 3

Nitrogen (Ellenberg): 3


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.4

July Mean Temperature (Celsius): 15.4

Annual Precipitation (mm): 701

Life form information

Height (cm): 70

Perennation - primary


Life Form - primary

Therophyte (annual land plant)



Clonality - primary

Little or no vegetative spread

Distribution information

Count of 10km squares in Great Britain: 336

Count of 10km squares in Ireland: 1

Count of 10km squares in the Channel Isles: 0

Weighted Changed Factor: 51

Weighted Change Factor Confidence (90%)


Distribution information

JNCC Designations


PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections. A hardcopy can be purchased from the Centre for Ecology and Hydrology.

Atlas text references

Beckett G, Bull A, Stevenson R
1999.  A flora of Norfolk.
Clement EJ
1999.  Misconceptions about Amsinckia lycopsoides Lehm. BSBI News. 80:44-45.
Simpson FW
1982.  Simpson's Flora of Suffolk.