Equisetum pratense |
Equisetum palustre |
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meadow horsetail, prêle des prés, shady horsetail |
marsh horsetail, prêle des marais |
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Sheaths | somewhat elongate, 3–5 × 2–4 mm; teeth 8–18, narrow, 1.5–4 mm, centers dark and margins white. |
elongate, 4–9 × 2–5 mm; teeth dark, 5–10, narrow, 2–5 mm, margins white, scarious. |
Aerial stems | dimorphic; vegetative stems green, branched, 16–50 cm; hollow center 1/6–1/3 stem diam. |
monomorphic, green, branched or unbranched, 20–80 cm; hollow center small, to 1/3 stem diam.; vallecular canals nearly as large. |
Fertile stems | brown, with stomates, initially unbranched, persisting and becoming branched and green after spore discharge. |
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Branches | in regular whorls, horizontal to drooping, solid; ridges 3; valleys channeled; 1st internode of each branch equal to or longer than subtending stem sheath; sheath teeth deltate. |
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. |
2n | =216. |
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Equisetum pratense |
Equisetum palustre |
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Phenology | Cones maturing in late spring. | Cones maturing in summer. |
Habitat | Meadows, wet woodlands | Marshes and swamps |
Elevation | 0–2000 m (0–6600 ft) | 0–1500m (0–4900ft) |
Distribution |
AK; CT; IA; IL; MA; ME; MI; MN; ND; NH; NY; VT; WI; AB; BC; MB; NB; NF; NS; NT; ON; PE; QC; SK; YT; n Eurasia to ne China; Japan in Hokkaido
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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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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.) |
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Source | FNA vol. 2. | FNA vol. 2. |
Parent taxa | Equisetaceae > Equisetum > subg. Hippochaete | Equisetaceae > Equisetum > subg. Hippochaete |
Sibling taxa | ||
Synonyms | E. palustre var. americanum | |
Name authority | Ehrhart: Hannover. Mag. 22: 138. (1784) | Linnaeus: Sp. Pl. 2: 1061. (1753) |
Web links |
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