General:
Perennial from a smooth, shiny, often reddish rhizome.

Stems:
30-150 cm tall, 2-10 mm thick, their central cavity more than 4/5 the stem diameter, simple or with a few whorled branches, the sheaths with 12-30 narrow, dark pointed teeth.

Cones:
1-2 cm long, rounded on the top.

Notes:
A hybrid with E. arvense (E. x litorale Kuehl ex Rupr.) is frequent in places where both species occur.

Source:  The Illustrated Flora of British Columbia

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration Source:  The Illustrated Flora of British Columbia

Flower Colour:
Green

Blooming Period:
Late Spring

Fruit/Seed characteristics:
Colour: Brown
Present over the Summer

Source:  The USDA

Synonyms and Alternate Names:
Equisetum fluviatile var. limosum (L.) Gilbert
Equisetum limosum L.