Taxon: Xanthium strumarium L. var. canadense (Mill.) Torr. & A. Gray

Synonym of Xanthium strumarium L.

References:

• Cronquist, A. et al. 1972–. Intermountain flora. [accepts].
• FNA Editorial Committee. 1993–. Flora of North America.
• Gleason, H. A. & A. Cronquist. 1991. Manual of vascular plants of northeastern United States and adjacent Canada, ed. 2. [accepts].
• Hess, H. E. et al. 1976. Flora der Schweiz, ed. 2. [accepts].
• Hitchcock, C. L. et al. 1955–1969. Vascular plants of the Pacific Northwest. [accepts].
• Lasser, T., ed. 1964–. Flora de Venezuela. [accepts].
• Löve, D. & P. Dansereau. 1959. Biosystematic studies on Xanthium: taxonomic appraisal and ecological status. Canad. J. Bot. 37:181. [= X. strumarium subsp. cavanillesii].
• Radford, A. E. et al., eds. 1980–. Vascular flora of the southeastern United States. [accepts].
• Scoggan, H. J. 1978–1979. The flora of Canada, 4 vol. [accepts].
• USDA, NRCS. United States Department of Agriculture, Natural Resources Conservation Service's PLANTS database (on-line resource). [accepts].
• Wu Zheng-yi & P. H. Raven et al., eds. 1994–. Flora of China (English edition).

Check other web resources for Xanthium strumarium L. var. canadense (Mill.) Torr. & A. Gray:

• PLANTS: USDA-NRCS Database of Plants of the United States and its Territories
• BONAP: North American Plant Atlas of the Biota of North America Program
• TROPICOS: Nomenclatural and Specimen Database of the Missouri Botanical Garden

Abbreviations & symbols in GRIN Taxonomy

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