Genus = Equisetum,
Displaying matches 1 - 9 of 9.
(= Equisetum arvense in Flora of the Pacific Northwest)
: Rhizomatous annual, the stems dimorphic; sterile stems 1.5-6 dm. tall and 1.5-5 mm. thick, prominently 10- to 12-ridged, the central cavity about 1/4 the diameter of the stem; stomates in 2 broad bands in the furrows; sheath 5-10 mm. long, greenish, with teeth 1-3 mm. long, free, firm and brown; fertile stems brownish to whitish, soon withering, simple, up to 3 dm. tall and 8 mm. thick, with sheaths 14-20 mm. long, and large teeth 5-9 mm. long.
Distribution: Cosmopolitan; throughout the Pacific Northwest
Habitat: Moist to moderately dry areas
(taxon is not treated in Flora of the Pacific Northwest)
(= Equisetum fluviatile in Flora of the Pacific Northwest)
Rhizomatous annual, the stems not dimorphic, up to 1 m. tall, shallowly 9- to 25-ridged and grooved, the ridges smooth; stomata in a single broad band in each furrow; central cavity large, more than 3/4 the diameter of the stem; sheaths green, 4-9 mm. long, with persistent, sharp, black teeth 1.5-3 mm. long.
Distribution: Alaska to Oregon, east across southern Canada and the northern tier of states in the United States.
Habitat: Shallow water, marshes and bogs, along muddy shores, from the lowlands to moderate elevations in the mountains.
(= Equisetum hyemale in Flora of the Pacific Northwest)
Rhizomatous, evergreen perennial, the stems all alike, mostly unbranched, 2-15 dm. tall and 4-14 mm. thick, with 18-40 ridges, each ridge with 2 rows of tubercles; central cavity at least 3/4 the diameter of the stem; stomates in 2 lines in each furrow; sheaths 5-15 mm. long, black banded at the tip and also with a lower black band, ashy- gray between the black bands, green below the lower band.
Distribution: Circumboreal; throughout the Pacific Northwest
Habitat: Moist to wet areas, lowlands to moderate elevations in the mountains
(= Equisetum palustre in Flora of the Pacific Northwest)
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.
Distribution: Circumboreal, south south in North America to southern Washington, northern Idaho, Nebraska and Pennsylvania.
Habitat: Streambanks, wet meadows, and marshes, from the lowlands to moderate elevations in the mountains.
(= Equisetum scirpoides in Flora of the Pacific Northwest)
Rhizomatous, evergreen perennial, the stems all alike, prostrate or ascending, firm, 0.7-2.5 dm. tall and 0.5-1 mm. thick, 6-grooved and angled, alternating grooves shallower and deeper; stomates in two rows in each principal furrow, sunken below the level of the epidermis; central cavity none; sheaths short and flaring, with a broad, black band above the green base; teeth of the sheath 3, thin and fragile, bristle-tipped, 1-2 mm. long.
Distribution: Circumboreal, south in North America to northeast Washington, east to northwest Montana, Minnisota, and New York.
Habitat: Moist, swampy places, especially in coniferous forests.
(= Equisetum sylvaticum in Flora of the Pacific Northwest)
Rhizomatous annual, the stems dimorphic, the sterile ones 3-7 dm. tall, 10- to 18-ridged, the central cavity more than 1/2 the diameter of the stem; stomates in 2 bands in the furrows; sheaths of the sterile stems 4-12 mm. long, green, the teeth 2-7 mm. long, cohering in several broad, brown, papery lobes. Fertile stems appearing earlier than the sterile, usually with longer teeth and sheaths, at first simple and pale, becoming branched and green.
Distribution: Alaska to Washington, east across southern Canada and northern United States to the Atlantic Coast
Habitat: Shady coniferous forests, bog edges and swamps
(= Equisetum telmateia in Flora of the Pacific Northwest)
Rhizomatous annual, the stems dimorphic; sterile stems 5-30 dm. tall and 0.5-2 cm. thick, 20- to 40-ridged, the central cavity about 1/4 the diameter of the stem; stomates in 2 broad bands in the furrows; sheath 1-2.5 cm. long, with slender, tapered teeth 3-8 mm. long; fertile stems 2.5-6 dm. tall and 1.5-2 cm. thick; sheaths 2-5 cm. long, with 20-30 prominent teeth fused in groups of 2-4.
Distribution: British Columbia to California, east to Idaho
Habitat: Moist areas in the lowlands
(= Equisetum variegatum in Flora of the Pacific Northwest)
Stems evergreen, perennial, from black, smooth rhizomes, all alike, ascending or erect, 1-3 dm. tall and 1-2 mm. thick, branched near the base; stems 5-to 12-ridged, the ridges very shallow; stomates in 2 rows in each furrow, sunken below the level of the epidermis; central cavity 1/4 to 1/3 the diameter of the stem; sheaths 2-4 mm. long, green with black tips, the teeth with conspicuous white margins, abruptly contracted to a hair-like tip.
Distribution: Alaska to Oregon, east across southern Canada and the northern third of the United States
Habitat: Wet places, sea level to alpine
