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Ageratina altissima var. altissima
Ageratina altissima (L.) King & H. Rob. var. altissima
White Snakeroot
Asteraceae (Aster Family)
Synonym(s): Ageratum altissimum, Eupatorium rugosum, Eupatorium rugosum var. chlorolepis, Eupatorium rugosum var. tomentellum, Eupatorium rugosum var. villicaule, Eupatorium urticifolium var. tomentellum
USDA Symbol: AGALA
USDA Native Status: L48 (N), CAN (N)
An erect, much-branched perennial up to 4 ft. tall. Large, opposite, pointed-oval leaves. Flowers are tiny, pure white, and in flattish clusters near the top of the stalk.
Plant Characteristics
Duration: PerennialHabit: Herb
Size Notes: Up to about 4 feet tall.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.
Bloom Information
Bloom Color: WhiteBloom Time: Aug , Sep , Oct
Distribution
USA: AL , AR , CT , DC , DE , FL , GA , IA , IL , IN , KS , KY , LA , MA , MD , ME , MI , MN , MO , MS , NC , ND , NE , NH , NJ , NY , OH , OK , PA , RI , SC , SD , TN , TX , VA , VT , WI , WVCanada: NB , NS , ON , QC , SK
Native Distribution: Eastern Canada to Sask., s. to WV, upland GA & e. TX
Native Habitat: Rich woods; thickets; clearings; shady river bottoms
Growing Conditions
Light Requirement: Part Shade , ShadeSoil Moisture: Moist
Soil pH: Circumneutral (pH 6.8-7.2)
Soil Description: Rich soils.
Conditions Comments: Spreads by seed and can become weedy.
Benefit
Conspicuous Flowers: yesAttracts: Birds
Propagation
Description: Sow seeds in the fall and plant thickly as germination is usually low. Vigorous portions of mature clumps can be divided in spring or fall.Commercially Avail: yes
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:Lady Bird Johnson Wildflower Center - Austin, TX
Stengl Biological Research Station - Smithville, TX
Mt. Cuba Center - Hockessin, DE
Bibliography
Bibref 1294 - The Midwestern Native Garden: Native Alternatives to Nonnative Flowers and Plants An Illustrated Guide (2011) Adelman, Charlotte and Schwartz, Bernard L.Search More Titles in Bibliography
Web Reference
Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.Additional resources
USDA: Find Ageratina altissima var. altissima in USDA PlantsFNA: Find Ageratina altissima var. altissima in the Flora of North America (if available)
Google: Search Google for Ageratina altissima var. altissima
Metadata
Record Modified: 2022-10-31Research By: TWC Staff