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Ambrosia trifida (Giant Ragweed), fruit, matureOctober 6 2012
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), habit, summerAugust 2 2012
Hedborn Jr., Edward A.
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Ambrosia trifida (Giant Ragweed), habitat, habit, fallOctober 6 2012
Hedborn Jr., Edward A.
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Ambrosia trifida (Giant Ragweed), inflorescenceSeptember 5 2015
Brown, Deborah J. G.
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Ambrosia trifida (Giant Ragweed), inflorescenceSeptember 5 2015
Brown, Deborah J. G.
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Ambrosia trifida (Giant Ragweed), inflorescenceAugust 2 2012
Hedborn Jr., Edward A.
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Ambrosia trifida (Giant Ragweed), infructescenceOctober 6 2007
Hedborn Jr., Edward A.
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Ambrosia trifida (Giant Ragweed), leaf, summer, leaf, upper surfaceAugust 2 2012
Hedborn Jr., Edward A.
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Ambrosia trifida (Giant Ragweed), leaf, upper surfaceAugust 2 2012
Hedborn Jr., Edward A.