Equisetum hyemale |
Equisetum laevigatum |
|
---|---|---|
scouring rush |
smooth scouring rush |
|
Sheaths | rectangular, 7–12 × 5–6 mm (uppermost sheath shorter); same color as stem and continuous with it; except for a terminal black band formed by the inturned persistent bases of the teeth; teeth earlydeciduous, articulated and campanulate. |
|
Aerial stems | annual, monomorphic; up to 120 cm tall, usually simple, occasionally with a few hollow ascending branches, green; ribs 16–30, not furrowed; central cavity up to 75% of the stem diameter. |
|
Branches | (when present) with a dark base; first internode very short. |
|
Cones | shortly exserted from the terminal sheath or subsessile; blunt. |
|
2n | =216. |
|
Equisetum hyemale |
Equisetum laevigatum |
|
Distribution | ||
Discussion | Moist meadows, roadsides, and river banks. 50–2000 m. All ecoregions except Est. CA, ID, NV, WA; throughout North America. Native. |
|
Source | Flora of Oregon, volume 1, page 79 Duncan Thomas |
|
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Equisetum funstonii, Equisetum kansanum | |
Web links |
|
|