Equisetum hyemale |
Equisetum ×nelsonii |
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common scouring-rush, prêle d'hiver, scouring horsetail, scouring rush, scouringrush horsetail, tall scouring-rush |
horsetail, Nelson's horsetail |
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Sheaths | green, elongate, 3.5–7.5 × 2–4 mm; teeth 6–14, centers brown and margins white, prominent, tip usually brown, long, filiform. |
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Aerial stems | persisting less than a year or only the proximal part overwintering, unbranched, 20–60 cm; lines of stomates single; ridges 6–14. |
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Cone | apex pointed; spores white, misshapen. |
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Equisetum hyemale |
Equisetum ×nelsonii |
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Phenology | Cones maturing in early summer, but spores not shed. | |
Habitat | Lakeshores, riverbanks. | |
Distribution |
AL; AR; AZ; CA; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NF; NS; NT; ON; PE; QC; SK; YT; Mexico; Central America in Guatemala; Europe; Asia
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IL; IN; MI; MN; MT; NY; OR; WI; WY; ON; QC |
Discussion | Subspecies 2 (1 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Equisetum × nelsonii, the hybrid between E. laevigatum and E. variegatum, is often mistaken for small forms of E. × ferrissii. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 2. | FNA vol. 2, p. 84. |
Parent taxa | Equisetaceae > Equisetum > subg. Equisetum | Equisetaceae > Equisetum > subg. Equisetum |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | E. variegatum var. nelsonii | |
Name authority | Linnaeus: Sp. Pl. 2: 1062. (1753) | (A. A. Eaton) J. H. Schaffner: Amer. Fern J. 16: 46. (1926) |
Web links |
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