Bull Thistle      Cirsium vulgare (Savi) Ten.
Photographs by Dr. Michael Pfeiffer
Sign Invasive
Infestation and Habitat
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Foliage
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Mature Plant
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Plant
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Flower
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Flower and Involucre
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Leaves
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Stems
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Plant and Flowers
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Mature Plant
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Plant with Seed
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Plant with Seed
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Seedling
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Seedling
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Rosette
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Dried Involucres
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Biennial