Scientific Name: Ageratina altissima (L.) R. M. King & H. Rob.
Caption: Pollen grain of Ageratina altissima
Photographer: Gretchen Jones @ http://pollen.usda.gov/index.htm
Notes: Pollen grain of Ageratina altissima

Jones, G. D., & Wilson E. F. (2001).  'Pollen as Indicators of Source Areas and Foraging Resources.'

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