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Eupatorieae genusEupatorium Show Lower Taxa Eupatorium album, Eupatorium altissimum, Eupatorium anomalum, Eupatorium cannabinum, Eupatorium capillifolium

tribeBrassicaceae tribe Sisymbrieae genusSisymbrium Show Lower Taxa Sisymbrium altissimum, Sisymbrium erysimoides, Sisymbrium irio, Sisymbrium linifolium, Sisymbrium

familyAsteraceae tribeAsteraceae tribe Cardueae genusCirsium Show Lower Taxa Cirsium altissimum, Cirsium andersonii, Cirsium andrewsii, Cirsium arizonicum, Cirsium arvense

Nesom Common names: White snakeroot IllustratedEndemic Basionym: Ageratum altissimum Linnaeus Sp. Pl. 2: 839. 1753, Treatment appears in FNA Volume 21. Treatment

familyAsteraceae tribeAsteraceae tribe Eupatorieae genusEupatorium speciesEupatorium altissimum Linnaeus Sp. Pl. 2: 837. 1753. Kunsiri Chaw Siripun, Edward E. Schilling

tribeBrassicaceae tribe Sisymbrieae genusSisymbrium speciesSisymbrium altissimum Linnaeus Sp. Pl. 2: 659. 1753. Ihsan A. Al-Shehbaz Common names: Tumbleweed

1991) have treated them as C. altissimum. Still others considered them to be derivatives of hybridization between C. altissimum and C. discolor (J. T. Kartesz

Synonyms: Epilobium adenocladum (Haussknecht) Rydberg (as adenocladon) E. altissimum Suksdorf E. apricum Suksdorf E. fasciculatum Suksdorf E. hammondii Howell

confusing history. Some have argued that Jacquin based his Epidendrum altissimum on an illustration published by Sloane, which is represented by the current

England states and the southern Appalachians. It hybridizes with both C. altissimum (discussed thereunder) and C. muticum (G. B. Ownbey 1951b, 1964; W. L

glomeratus, Onopordum acanthium, Salsola ibirica, S. kali, and Sisymbrium altissimum, have become common (A.Cronquist et al. 1972+, vol. 1; N.E. West 1988;