in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 663. 1838
Phenology: Flowering late spring–summer (May–Sep).
Habitat: Fields, roadsides, riverbanks, ditch banks, clearcuts, cultivated ground
Elevation: 0–2300 m
Alta., B.C., Man., Ont., Sask., Ariz., Calif., Colo., Idaho, Iowa, Kans., Minn., Mont., Nebr., Nev., N.Mex., N.Dak., Okla., Oreg., S.Dak., Tex., Utah, Wash., Wyo., Mexico (Baja California), c Asia.
Acroptilon repens has been reported also from Arkansas, Illinois, Indiana, Kentucky, Louisiana, Michigan, Missouri, New York, Ohio, Virginia, and Wisconsin; I have not seen specimens from those states.
Acroptilon repens is a serious weed pest, especially in the western United States. It is a strong competitor in infested areas, often forming dense colonies, and has allelopathic effects on other plants growing nearby. It is very difficult to control or eradicate once it becomes established. It reproduces vigorously from seed and spreads from adventitious buds borne on deep-seated runner roots. Root fragments readily regenerate as new individuals after cultivation. In addition, Russian knapweed is very poisonous to horses, causing neurological symptoms. Because of its bitter taste, it is usually avoided by grazing animals, and consequently it tends to spread when more palatable plants are consumed.
|Author||David J. Keil +|
|Authority||(Linnaeus) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle +|
|Basionyms||Centaurea repens +|
|Distribution||Alta. +, B.C. +, Man. +, Ont. +, Sask. +, Ariz. +, Calif. +, Colo. +, Idaho +, Iowa +, Kans. +, Minn. +, Mont. +, Nebr. +, Nev. +, N.Mex. +, N.Dak. +, Okla. +, Oreg. +, S.Dak. +, Tex. +, Utah +, Wash. +, Wyo. +, Mexico (Baja California) + and c Asia. +|
|Elevation||0–2300 m +|
|Habitat||Fields, roadsides, riverbanks, ditch banks, clearcuts, cultivated ground +|
|Illustration copyright||Flora of North America Association +|
|Illustrator||John Myers +|
|Phenology||Flowering late spring–summer (May–Sep). +|
|Publication title||in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +|
|Publication year||1838 +|
|Source xml||https://firstname.lastname@example.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse grained fna xml/V19-20-21/V19 188.xml +|
|Synonyms||Acroptilon picris + and C. picris +|
|Taxon family||Asteraceae +|
|Taxon name||Acroptilon repens +|
|Taxon parent||Acroptilon +|
|Taxon rank||species +|
|Volume||Volume 19 +|