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    Identification of Knapweeds and Starthistles in the PNW

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    pnw432.pdf (861.6Kb)
    Date
    2000-06
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    Abstract
    An identification key and detailed line drawings of bracts, seeds, heads, rosettes, and plant shape offer an important tool for identifying these invasive plants. About 20 species of Centaurea have naturalized in western North America. 26 pages.
    URI
    http://hdl.handle.net/2376/7152
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