Equisetum arvense Linnaeus. Field Horsetail, Bottlebrush Horsetail. Phen: Mar-May. Hab: Moist streambanks, bottomlands, moist disturbed sites, road banks, railroad banks. Dist: A circumboreal species, in North America south to c. GA, c. AL, c. MS, n. AR, n. TX, NM, AZ, and south into Mexico.

Origin/Endemic status: Native

Synonymy: = Ar, C, FNA2, FoC, G, GrPl, Il, K1, K3, K4, Md, Mo1, NE, NY, Pa, RAB, S13, Sf, Tat, Tn, Tx, TxFerns, Va, W, WV, Christenhusz et al (2019); > Equisetum arvense L. var. arvense – F

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