| Synonyms |
- Equisetum affine Engelm.
- Equisetum hyemale L. ssp. affine (Engelm.) Calder & Taylor
- Equisetum hyemale L. var. californicum Milde
- Equisetum hyemale L. var. pseudohyemale (Farw.) Morton
- Equisetum hyemale L. var. robustum (A. Braun) A.A. Eat.
- Equisetum praealtum Raf.
- Equisetum robustum A. Braun
- Hippochaete hyemalis (L.) Bruhin
- Hippochaete hyemalis (L.) Bruhin ssp. affinis (Engelm.) W.A. Weber
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| Lower taxa | none |
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| Origin | native |
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| Growth habit | forb/herb |
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| Habitat | moist, shaded soil of sandy riversides, slopes |
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| Range | through northern New Jersey and along the Delaware River southward; rare in Cape May and Atlantic Counties |
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| Frequency | frequent |
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| Rank | G5 N5? SNR |
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| Status | none |
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| Wetland status | US: FAC+, FACW; Northeastern Region: FACW |
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| Reproductive parts present | sporophylls late April to September, some later |
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| Comments | Evergreen; forms dense colonies. Var. affine is the only variety of Equisetum hyemale in the United States. |
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