FEIS: DISTRIBUTION AND OCCURRENCE: "Spotted knapweed is native to eastern Europe, though it now occurs in western and central Europe. It was introduced to North America, probably as a contaminant in alfalfa (Medicago sativa) seed and/or ship's ballast, in the late 1800s ... . In 1920, the distribution of spotted knapweed in North America was limited to the San Juan Islands, Washington."
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2021 Patrick Hoffman:!2022 Patrick Hoffman:!2019 Amanda Mills:!2012 Zoya Akulova:!2020 Catherine Talbot:!2018 TRWC Weed Warriors:!2022 Steven Farris:!2021 Orrin Winton:!2020 Patrick Hoffman:!2020 Patrick Hoffman:!2019 Amanda Mills:!2012 Zoya Akulova:!
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Suggested Citation
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2023. Berkeley, California:The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 06/02/2023).