Delaware Wildflowers
Ageratina altissima
(L.) King & H.E. Robins.
var.
altissima
White Snakeroot
(White Snakeroot)
(
Eupatorium rugosum
)
Asteraceae
— Aster family
Native
New Castle County
September 2001
White Clay Creek State Park -- Possum Hill
August 2011
Middle Run Valley Natural Area
September 2014