General:
Aquatic herb, usually without roots; stems freely branching, 0.3-4.0 m long.

Leaves:
Stem leaves submerged, in whorls of 5-12, 2-3 times forked into linear or threadlike segments, these often stout, stiff and spiny-toothed.

Flowers:
Inflorescence of solitary, minute, axillary flowers; petals lacking; sepals 3-15, sometimes petal-like; stamens 12-16.

Fruits:
Achenes usually lacking, if present then much flattened, 4-6 mm long, ellipsoid, wingless with a persistent style and 2 basal spines.

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:
Blue

Blooming Period:
Summer

Fruit/Seed characteristics:
Colour: White
Present from Summer to Fall

Source:  The USDA

Synonyms and Alternate Names:
Ceratophyllum apiculatum Cham.
Ceratophyllum demersum var. apiculatum (Cham.) Asch.
Ceratophyllum demersum var. apiculatum (Cham.) Garcke