General:
Perennial aquatic herb without roots; stems very slender, floating, submerged or creeping along the bottom, leafy, up to 50 cm long, 0.4 mm thick.

Leaves:
Alternate, numerous, 0.5-2 cm long, divided into 3 parts at the base and then again 1-3 times into 20 or more thread-like segments, the ultimate ones blunt, usually without bladders but, if present, borne on branches distinct from those bearing the leaves and 2-4 mm wide, leaf margins bristly, the hyaline bristles arising directly from the margins (20x magnification); winter buds 7-16 mm long, bristly.

Flowers:
Inflorescence of 2-4 flowers in lax racemes at the end of stalks 6-20 cm long; corollas yellow, 10-15 mm long, lower lips 8-12 mm long, the spurs parallel to, and over 1/2 the length of the lower lips, the lower lips broad.

Fruits:
Capsules, stalks nearly erect.

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