| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Equisetaceae | Equisetum ×jesupii | Jesup's Horsetail | Wet thickets, bogs, shores. | NL west to AK, south to n. NJ, s. OH, c. IL, WY, ID, and OR. | |
| Equisetaceae | Equisetum ×litorale | Shore Horsetail | Reported by FNA for VA. | ||
| Equisetaceae | Equisetum ×nelsonii | Nelson's Scouring-Rush | Shores and banks. | QC, ON, MT, and OR, south to NY, IN, IL, and WY. | |
| Equisetaceae | Equisetum arvense | Field Horsetail, Bottlebrush Horsetail | Moist 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. |  |
| Equisetaceae | Equisetum ferrissii | Ferriss's Horsetail | Riverbanks, 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). | |
| Equisetaceae | Equisetum fluviatile | Water Horsetail, Pipes | Open 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. |  |
| Equisetaceae | Equisetum laevigatum | Smooth Scouring-Rush | Moist 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. Reported for Warren County, w. VA (Sheik & Weeks 2023). There are old reports, repeated in RAB, and S, of this species farther south; documentation of these reports is not known and may be based on misapplication or misidentification. |  |
| Equisetaceae | Equisetum palustre | Marsh Horsetail | Marshes, 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. |  |
| Equisetaceae | Equisetum praealtum | Tall Scouring-Rush, River Scouring-Rush | Riverbanks, alluvial floodplains. | Widespread in North America, and south to s. Mexico and El Salvador. |  |
| Equisetaceae | Equisetum pratense | Meadow Horsetail | Streambanks, moist forests. | Circumboreal, south in North America to n. NJ, w. NY, s. MI, n. IL, IA, w. SD, w. MT, and BC. |  |
| Equisetaceae | Equisetum ramosissimum var. ramosissimum | Branched Scouring-Rush | Disturbed 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, LA. It is locally naturalized on the Wilmington waterfront, persisting in disturbed areas, such as in gravel along railroad tracks. Hauke (1979, 1984, 1992) discusses the occurrence of this species in North America. |  |
| Equisetaceae | Equisetum scirpoides | Dwarf Scouring-Rush | Fens, conifer swamps. | Circumboreal, south in North America to MA, CT, s. NY, nw. PA, n. IL, ne. IA, SD, WY, ID, and WA. |  |
| Equisetaceae | Equisetum sylvaticum | Woodland Horsetail | Seepage swamps. | Circumboreal, south in North America to MD, n. VA, ec. WV, OH, MI, WI, IA, WY, MT, and WA. |  |
| Equisetaceae | Equisetum variegatum | Variegated Scouring-Rush | Wet 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. |  |
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