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Ageratina altissima (L.) King & H.E. Robins. var. altissima
White Snakeroot

(White Snakeroot)
(Eupatorium rugosum)
Asteraceae — Aster family
Native

Ageratina altissima var. altissima
New Castle County
September 2001
Ageratina altissima var. altissima
White Clay Creek State Park -- Possum Hill
August 2011
Ageratina altissima var. altissima
Middle Run Valley Natural Area
September 2014