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Caption: Spiny sowthistle
Photo by: T. W. Miller
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Caption: Perennial sowthistle glandular hairs
Photo by: T. W. Miller
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Caption: Annual sowthistle flower heads
Photo by: T. W. Miller
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Caption: Annual sowthistle leaf at base of stem
Photo by: J.A. Kropf
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Caption: Line drawing of annual sowthistle
Photo by: Ciba Geigy
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Caption: Annual sowthistle flower
Photo by: T. W. Miller
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Caption: Annual sowthistle
Photo by: C.R. Foss
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Caption: Annual sowthistle mature head
Photo by: T. W. Miller
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