Ageratina altissima (Canada)

Ageratina altissima (L.) R.M.King & H.Rob., Phytologia 19 212 1970. (syn: Ageratina ageratoides (L.fil.) Spach; Ageratum altissimum L.; Batschia nivea Moench; Eupatorium aboriginum E.Greene; Eupatorium ageratoides L.fil. (ambiguous synonym); Eupatorium ageratoides var. angustatum A.Gray; Eupatorium altissimum (L.) Murray (ambiguous synonym); Eupatorium boreale E.Greene; Eupatorium eurybiifolium E.Greene; Eupatorium frasieri Poir.; Eupatorium odoratum Walt. (ambiguous synonym); Eupatorium rugosum Houtt. (ambiguous synonym); Eupatorium rugosum var. chlorolepis Fern.; Eupatorium rugosum var. tomentellum (B.L.Rob.) S.F.Blake; Eupatorium rugosum var. villicaule (Fern.) S.F.Blake; Eupatorium urticifolium var. tomentellum B.L.Rob.; Eupatorium urticifolium var. villicaule Fern.; Kyrstenia aboriginum (E.Greene) E.Greene; Kyrstenia altissima (L.) E.Greene; Kyrstenia borealis (E.Greene) E.Greene);     

USA (Alabama, Arkansas, Connecticut, District of Columbia, Delaware, Florida, Georgia, Iowa, Illinois, Indiana, Kansas, Kentucky, Louisiana, Massachusetts, Maryland, Maine, Michigan, Minnesota, Missouri, Mississippi, North Carolina, North Dakota, Nebraska, New Hampshire, New Jersey, New York, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Virginia, Vermont, Wisconsin, West Virginia), Canada (New Brunswick, Nova Scotia, Northern Territories, Ontario, Quebec), South Africa (I) (Limpopo (I)), Belgium (I), Germany (I), Austria (I), Poland (I), Hungary (I), Korea (I) as per Catalogue of Life;
 
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Ageratina altissima from Canada-GS06032020-7 : 1 post by 1 author. Attachments (2)
Ageratina altissima (L.) King & H.E.Robins.
Common name: White snakeroot
Differing from A. adenophora in perennial habit, absence of glandular hairs on stem and leaves, larger leaves (4-11 cm long as against 3-6 cm), absence of glandular hairs on outer side of involucre bracts.
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