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Ageratina altissima var. roanensis (Appalachian white snakeroot)
Brundage, Stephanie

Ageratina altissima var. roanensis

Ageratina altissima (L.) King & H. Rob. var. roanensis (Small) Clewell & Woot.

Appalachian White Snakeroot, Appalachian Tall Boneset

Asteraceae (Aster Family)

Synonym(s): Eupatorium roanense, Eupatorium rugosum var. roanense, Eupatorium urticifolium


USDA Native Status: L48 (N)


From the Image Gallery

19 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb , Subshrub , Shrub
Size Notes: About 2-1/2 feet in height. Individual plants can reach 6 feet in height.
Size Class: 1-3 ft. , 3-6 ft.

Bloom Information

Bloom Color: White
Bloom Time: Jul , Aug , Sep , Oct


USA: AL , GA , KY , NC , SC , TN , VA , WV


Warning: Ageratina altissima contains the toxin tremetol. It is poisonous to livestock and to humans. Humans may be poisoned by consuming meat or milk from poisoned animals and many early European-Americans died in this way. This malady is commonly referred to as Milk Sickness.
Conspicuous Flowers: yes
Nectar Source: yes
Poisonous: yes

Additional resources

USDA: Find Ageratina altissima var. roanensis in USDA Plants
FNA: Find Ageratina altissima var. roanensis in the Flora of North America (if available)
Google: Search Google for Ageratina altissima var. roanensis


Record Modified: 2021-03-18
Research By: JAM

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