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FamilyScientific Name Common NameHabitatDistributionImage
EquisetaceaeEquisetum arvenseField Horsetail, Bottlebrush HorsetailMoist streambanks, bottomlands, moist disturbed sites, road banks, railroad banks.A circumboreal species, in North America south to c. GA, c. AL, c. MS, n. AR, n. TX, NM, AZ, and south into Mexico.image of plant
EquisetaceaeEquisetum fluviatileWater Horsetail, PipesOpen calcareous wetlands, wet meadows, river and lake margins.Circumboreal, south in North America to n. VA, n. WV, PA, OH, IN, IL, IA, and WA.image of plant
EquisetaceaeEquisetum praealtumTall Scouring-Rush, River Scouring-RushRiverbanks, alluvial floodplains.Widespread in North America south to s. Mexico and El Salvador.image of plant
EquisetaceaeEquisetum ramosissimum var. ramosissimumBranched Scouring-RushDisturbed areas.Native of the Old World, where it is widespread in Europe, Asia, and Africa. This species was apparently introduced long ago on ship's ballast to various old ports, such as Wilmington (New Hanover County, NC), Pensacola (Escambia County, FL) and New Orleans, LAimage of plant
EquisetaceaeEquisetum sylvaticumWoodland HorsetailSeepage swamps.Circumboreal, south in North America to MD, n. VA, ec. WV, OH, MI, WI, IA, WY, MT, and WA.image of plant
EquisetaceaeEquisetum ferrissiiFerriss's HorsetailRiverbanks, wet forests.There are old reports, repeated in RAB, S, and FNA, of the occurrence of E. ×ferrissii in NC and SC; documentation of these reports is not known; it is reported for Prince George's County, MD (Shetler & Orli 2000), for KY (Campbell & Medley 2007), and for all 75 counties of AR (Peck 2011).
EquisetaceaeEquisetum laevigatumSmooth Scouring-RushMoist areas.QC and BC south to NY, w. PA, s. OH, s. IN, s. IL, AR (Peck 2011), e. TX, NM, AZ, CA, and n. Mexico.image of plant
EquisetaceaeEquisetum ×litoraleShore HorsetailReported by FNA for VA.
EquisetaceaeEquisetum palustreMarsh HorsetailMarshes, wet meadows, streambanks, often calcareous.Circumboreal, south in North America to s. MI, IL, ne. SD, ID, and OR. A report from n. NJ appears to be misidentified.image of plant
EquisetaceaeEquisetum pratenseMeadow HorsetailStreambanks, moist forests.Circumboreal, south in North America to n. NJ, w. NY, s. MI, n. IL, IA, w. SD, w. MT, and BC.image of plant
EquisetaceaeEquisetum scirpoidesDwarf Scouring-RushFens, conifer swamps.Circumboreal, south in North America to MA, CT, s. NY, nw. PA, n. IL, ne. IA, SD, WY, ID, and WA.image of plant
EquisetaceaeEquisetum variegatumVariegated Scouring-RushWet thickets, bogs, shores.Circumboreal, south in North America to n. NJ, nw. PA, n. OH, n. IN, c. IL, c. MN, w. SD, NM, AZ, and OR.image of plant
EquisetaceaeEquisetum ×jesupiiJesup's HorsetailWet thickets, bogs, shores.NL west to AK, south to n. NJ, s. OH, c. IL, WY, ID, and OR.
EquisetaceaeEquisetum ×nelsoniiNelson's Scouring-RushShores and banks.QC, ON, MT, and OR, south to NY, IN, IL, and WY.

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