Knapweed

Knapweed

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Credit: GAIL JANKUS/SCIENCE PHOTO LIBRARY

Caption: Black Knapweed (Centaurea nigra) is also known as star thistle. It is a moderately invasive species from Europe that is now well established along the eastern seaboard of the US and southern Canada. This one was photographed at the Ward Pound Ridge Reservation in New York State.

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Keywords: black knapweed, botany, centaurea, centaurea nigra, flora, flower, knapweed, nature, new york, nigra, plant, plants, star thistle, ward pound ridge reservation, wildflower

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