Ageratina altissima (white snakeroot) leaf paradermal section illustrating tubular cavities. Curtis and Lersten. Amer. J. Bot. 73 1016-1021.
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| Curtis, Lersten, and Nowak 2002 rev. 2015 | |||||
Ageratina altissima (white snakeroot) leaf paradermal section illustrating tubular cavities. Curtis and Lersten. Amer. J. Bot. 73 1016-1021. |
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