Ambrosiinae genusXanthium Show Lower Taxa Xanthium spinosum, Xanthium strumarium Linnaeus Sp. Pl. 2: 987. 1753. , Gen. Pl. ed. 5, 424. 1754. John L. Strother
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th Xanthium speciosum Kearney Xanthium strumarium var. canadense (Miller) Torrey & A. Gray Xanthium strumarium var. glabratum (de Candolle) Cronquist Xanthium
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annual hosts, including Ambrosia trifida, Dicoria canescens, and Xanthium strumarium (Asteraceae), and rarely Nicotiana tabacum (Solanaceae) (L. T. Collins
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