Pistillate flower of Ambrosia trifida (giant ragweed). Lersten and Curtis. 1989. Amer. J. Bot. 76: 1000-1005.
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| Curtis, Lersten, and Nowak 2002 rev. 2015 | |||||
Pistillate flower of Ambrosia trifida (giant ragweed). Lersten and Curtis. 1989. Amer. J. Bot. 76: 1000-1005. |
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