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common scouring-rush, prêle d'hiver, scouring horsetail, scouring rush, scouringrush horsetail, tall scouring-rush

horsetail, Nelson's horsetail

Sheaths

green, elongate, 3.5–7.5 × 2–4 mm;

teeth 6–14, centers brown and margins white, prominent, tip usually brown, long, filiform.

Aerial stems

persisting less than a year or only the proximal part overwintering, unbranched, 20–60 cm;

lines of stomates single;

ridges 6–14.

Cone

apex pointed;

spores white, misshapen.

Equisetum hyemale

Equisetum ×nelsonii

Phenology Cones maturing in early summer, but spores not shed.
Habitat Lakeshores, riverbanks.
Distribution
from FNA
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
[WildflowerSearch map]
[BONAP county map]
from FNA
IL; IN; MI; MN; MT; NY; OR; WI; WY; ON; QC
[BONAP county map]
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
E. arvense, E. fluviatile, E. laevigatum, E. palustre, E. pratense, E. ramosissimum, E. scirpoides, E. sylvaticum, E. telmateia, E. variegatum, E. ×ferrissii, E. ×litorale, E. ×mackaii, E. ×nelsonii
E. arvense, E. fluviatile, E. hyemale, E. laevigatum, E. palustre, E. pratense, E. ramosissimum, E. scirpoides, E. sylvaticum, E. telmateia, E. variegatum, E. ×ferrissii, E. ×litorale, E. ×mackaii
Subordinate taxa
E. hyemale subsp. affine
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)
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