Equisetum palustre |
Equisetum hyemale |
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marsh horsetail, prêle des marais |
common scouring-rush, prêle d'hiver, scouring horsetail, scouring rush, scouringrush horsetail, tall scouring-rush |
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Sheaths | elongate, 4–9 × 2–5 mm; teeth dark, 5–10, narrow, 2–5 mm, margins white, scarious. |
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Aerial stems | monomorphic, green, branched or unbranched, 20–80 cm; hollow center small, to 1/3 stem diam.; vallecular canals nearly as large. |
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Branches | when present only from midstem nodes, spreading, hollow; ridges 4–6; valleys rounded; 1st internode of each branch shorter than subtending stem sheath; sheath teeth narrow. |
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2n | =216. |
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Equisetum palustre |
Equisetum hyemale |
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Phenology | Cones maturing in summer. | |
Habitat | Marshes and swamps | |
Elevation | 0–1500m (0–4900ft) | |
Distribution |
AK; CA; ID; ME; MI; MN; MT; ND; NH; NY; OR; PA; VT; WA; WI; AB; BC; MB; NB; NF; NS; NT; ON; PE; QC; SK; YT; Eurasia s to Himalayas; n China; Korea; Japan
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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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Discussion | The name Equisetum palustre var. americanum has been used for specimens from the flora that have longer teeth than those from Eurasia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Subspecies 2 (1 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 2. | FNA vol. 2. |
Parent taxa | Equisetaceae > Equisetum > subg. Hippochaete | Equisetaceae > Equisetum > subg. Equisetum |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | E. palustre var. americanum | |
Name authority | Linnaeus: Sp. Pl. 2: 1061. (1753) | Linnaeus: Sp. Pl. 2: 1062. (1753) |
Web links |
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