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(L.) R. Br.
sec. Gleason Cronquist 1991
common name: horseflyweed
Shenandoah National Park, Big Meadows, Madison County, Virginia, US
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whole plant - in flower - general view
inflorescence - lateral view of flower
Gleason Cronquist 1991 =
Gleason, Henry A. and Arthur Cronquist, 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, NY, US.
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