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Echinacea and monarch butterfly [graphic] / Brender à Brandis.2000
Brender à Brandis, Gerard William
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Arnoglossum atriplicifolium (Pale Indian-plantain), habit, summerJuly 13 2007
Hedborn Jr., Edward A.
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Ageratina altissima var. altissima (White Snakeroot), flower, sideSeptember 15 2007
Brown, Deborah J. G.
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Ageratina altissima var. altissima (White Snakeroot), habit, summerSeptember 15 2007
Hedborn Jr., Edward A.
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Ageratina altissima var. altissima (White Snakeroot), inflorescenceSeptember 15 2007
Brown, Deborah J. G.
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Ageratina altissima var. altissima (White Snakeroot), inflorescenceSeptember 15 2007
Hedborn Jr., Edward A.
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Ageratina altissima var. altissima (White Snakeroot), infructescenceOctober 5 2008
Brown, Deborah J. G.
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Ambrosia artemisiifolia (Common Ragweed), habit, fallOctober 4 2008
Brown, Deborah J. G.
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Ambrosia artemisiifolia (Common Ragweed), habit, spring, habit, youngJune 16 2008
Hedborn Jr., Edward A.
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Ambrosia artemisiifolia (Common Ragweed), habit, spring, seedlingJune 16 2008
Brown, Deborah J. G.
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Ambrosia artemisiifolia (Common Ragweed), habit, summerSeptember 15 2007
Hedborn Jr., Edward A.
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Ambrosia artemisiifolia (Common Ragweed), habit, summerJuly 28 2008
Hedborn Jr., Edward A.
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Ambrosia artemisiifolia (Common Ragweed), inflorescenceSeptember 15 2007
Hedborn Jr., Edward A.
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Ambrosia artemisiifolia (Common Ragweed), leaf, summerJuly 28 2008
Hedborn Jr., Edward A.
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Ambrosia artemisiifolia (Common Ragweed), leaf, upper surfaceJuly 28 2008
Hedborn Jr., Edward A.
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Ambrosia trifida (Giant Ragweed), habit, fallSeptember 16 2007
Brown, Deborah J. G.
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Ambrosia trifida (Giant Ragweed), infructescenceOctober 6 2007
Hedborn Jr., Edward A.
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Arctium minus (Common Burdock), habit, summerSeptember 15 2007
Brown, Deborah J. G.