Equisetum palustre |
Equisetum ×ferrissii |
|
---|---|---|
marsh horsetail |
Ferriss' scouring rush |
|
Habit | Rhizomatous annual, the stems not dimorphic, 2-8 dm. tall, with 5 to 10 deep grooves, the ridges smooth; stomates in a single, broad band in each furrow; central cavity less than 1/3 the diameter of the stem; sheathes green, 5-10 mm. long, with persistent teeth 3-7 mm. long, black or dark brown with broad, pale, papery margins. | Annual to perennial herb, 20-180 cm; sheath 7-17 mm, 3-12 mm broad, commonly with dark bands; teeth 14-32, deciduous or persistent. |
Leaves | Branches few and irregular to many and whorled, 5- to 6-angled, simple. |
None |
Spores | Cones pedunculate, blunt, deciduous. |
Cone tip pointed; spores white and mishappen. |
Equisetum palustre |
Equisetum ×ferrissii |
|
Habitat | Streambanks, wet meadows, and marshes, from the lowlands to moderate elevations in the mountains. | Dry to wet, often disturbed areas, including gravelly roadsides. |
Distribution | Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across the northern U.S. and Canada to the Atlantic Coast; circumboreal.
|
Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to California, east across most of North America to the Atlantic Coast.
|
Origin | Native | Native |
Conservation status | Not of concern | Not of concern |
Sibling taxa | ||
Web links |
|
|