Smith, R.W.
Ageratina altissima (L.) King & H.E. Robins.
White snakeroot
Asteraceae (Aster Family)
Solitary or clustered firm stems bear flat-topped clusters of small fuzzy white flower heads composed entirely of disk flowers.
This plant used to be placed in the
genus Eupatorium, as did Smaller White Snakeroot (
A. aromatica), a nonaromatic plant despite its name; it has less coarsely
toothed leaves, the upper ones stalkless. Other similar species are Late-flowering Thoroughwort (
Eupatorium serotinum), which has long-stalked
lanceolate leaves with 3-5 main veins, and Hyssop-leaf Thoroughwort (
E. hyssopifolium), with very narrow leaves in whorls of 3-4.
Image Gallery:
1 photo(s) available
Plant Characteristics
Duration: Perennial Habit: Herb Flower:
Fruit: Size Class: 1-3 ft.
Bloom Information
Bloom Time: Jul , Aug , Sep , Oct
Distribution
USA: AL , AR , CT , DE , FL , GA , IL , IN , IA , KS , KY , LA , ME , MD , MA , MI , MN , MS , MO , NE , NH , NJ , NY , NC , ND , OH , OK , PA , RI , SC , SD , TN , TX , VT , VA , WV , WI , DC
Canada: NB ,
NS ,
ON ,
SK Native Distribution: S. Ontario to New Brunswick; south through New England to Virginia and upland Georgia; west to Louisiana and ne. Texas; north to Wisconsin.
Native Habitat: Woods and thickets.
USDA Native Status: L48(N), CAN(N) Growing Conditions
Water Use: Low
Light Requirement: Sun , Part Shade
Soil Moisture: Moist , Dry
Drought Tolerance: High
Conditions Comments: Prefers full sun but will tolerate shade in more southern locations.
Last Update: 2012-06-20
