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Equisetum ferrissii Clute. Common name: Ferriss's Horsetail. Phenology: May-Aug. Habitat: Riverbanks, wet forests. Distribution: 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).

Origin/Endemic status: Native

Taxonomy Comments: This is the hybrid of E. laevigatum and E. praealtum (= E. hyemale ssp. affine). It behaves as a species, often occurring independent of one or both parents.

Synonymy ⓘ: = G; = Equisetum ferrissii Clute — Ar, C, Can, FNA2, GrPl, Il, NE, NS, Pa, POWO, TxFerns, Christenhusz et al (2019); = Hippochaete ×ferrissii (Clute) Škoda & Holub; >< Equisetum ferrissii Clute — K4. Basionym: Equisetum ferrissii Clute 1904

Links to other floras: = Equisetum ×ferrissii - FNA2

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: FACW (name change)
  • Eastern Mountains and Piedmont: FACW (name change)
  • Great Plains: FACW (name change)
  • Midwest: FACW (name change)
  • Northcentral & Northeast: FACW (name change)

Heliophily ⓘ: 5

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Horticultural Information

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