familyBrassicaceae tribeBrassicaceae tribe Thlaspideae genusThlaspi speciesThlaspi arvense Linnaeus Sp. Pl. 2: 646. 1753. Ihsan A. Al-Shehbaz Common names: Fanweed field
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included in C. arvense as a variety or subspecies. However, morphological characters and chromosome number (diploid in the native forms of C. arvense, tetraploid
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Equisetaceae Equisetum scirpoides Equisetum hyemale subsp. affine Equisetum arvense John Myers John Myers John Myers Equisetaceae Equisetaceae Equisetum subg
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Cerastium tomentosum hybridizes readily with the introduced C. arvense subsp. arvense (J. K. Morton 1973). North American reports of Cerastium biebersteinii
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, Wash., W.Va., Wis., Wyo. Equisetum × litorale is a hybrid between E. arvense and E. fluviatile. It should be expected where the parents coexist. This
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documented most frequently parasitizing introduced clovers (mainly Trifolium arvense and T. repens), and collected rarely on Crotalaria (J. W. Thieret 1971)
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other species. The blunt sepals help to distinguish this species from C. arvense subsp. strictum, with which it is most likely to be confused. The epithet
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were named C. regelii var. hirsutum Hultén. An apparent hybrid with C. arvense subsp. strictum also has been collected along the Nisling River in the Yukon
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indicative of its invasiveness. Spontaneous hybrids between C. palustre and C. arvense have been reported from England and other European countries (W. A. Sledge
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