Equisetum pratense |
Equisetum scirpoides |
|
---|---|---|
meadow horsetail, prêle des prés, shady horsetail |
dwarf horsetail, dwarf scouring-rush, prêle faux-scirpe, sedgelike horsetail |
|
Sheaths | somewhat elongate, 3–5 × 2–4 mm; teeth 8–18, narrow, 1.5–4 mm, centers dark and margins white. |
green proximally, black distally, elliptic in face view, 1–2.5 × 0.75–1.5 mm; teeth 3, dark with white margins, not articulate to sheath. |
Aerial stems | dimorphic; vegetative stems green, branched, 16–50 cm; hollow center 1/6–1/3 stem diam. |
persisting more than a year, unbranched, tortuous, 2.5–28 cm; lines of stomates single; ridges 6. |
Fertile stems | brown, with stomates, initially unbranched, persisting and becoming branched and green after spore discharge. |
|
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. |
|
Cone | apex pointed; spores green, spheric. |
|
2n | =216. |
|
Equisetum pratense |
Equisetum scirpoides |
|
Phenology | Cones maturing in late spring. | Cones maturing in summer, or cones overwintering and shedding spores in spring. |
Habitat | Meadows, wet woodlands | Wet woods, peat bogs, tundra |
Elevation | 0–2000 m (0–6600 ft) | 0–1000 m (0–3300 ft) |
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; IA; ID; IL; MA; ME; MI; MN; MT; NH; NY; SD; VT; WA; WI; AB; BC; MB; NB; NF; NS; NT; ON; PE; QC; SK; YT; SPM; Greenland; n Eurasia
|
Source | FNA vol. 2. | FNA vol. 2. |
Parent taxa | Equisetaceae > Equisetum > subg. Hippochaete | Equisetaceae > Equisetum > subg. Equisetum |
Sibling taxa | ||
Name authority | Ehrhart: Hannover. Mag. 22: 138. (1784) | Michaux: Fl. Bor.-Amer. 2: 281. (1803) |
Web links |