White Snakeroot

Ageratina altissima (Spreng.) King & H.E. Robins.
(formerly Eupatorium rugosum Houtt.)

Asteraceae (Aster Family)

▲ ▼ mature flowering plants

▲ ▼ flowering plants

▲ ▼ flowers

Ageratina altissima (Spreng.) King & H.E. Robins. (formerly Eupatorium rugosum Houtt.), White Snakeroot: (Bayer Code: EUPRU; US Code AGAL5)

Native simple to creeping perennial, growing 1-4 feet tall that can spread by short rhizomes
Has oval-shaped opposite, dark green to light green, triangular to oval-shaped leaves with toothed edges; petioles present; veins not real prominent
Flowers white, in head-like structures about 1/4 diameter, in small, flat-topped clusters at tips of top branches
Contains toxins that can be toxic to grazing livestock; toxins can pass into milk, and are toxic to humans, as well
Prefers field edges or open woodland pastures (part shade)

(Updated January 19, 2019)