E-Flora BC: Electronic Atlas of the Flora of British Columbia

General:
Perennial aquatic herb without roots; stems very slender, floating, submerged or creeping along the bottom, up to 25 cm long.

Leaves:
Stem leaves alternate, numerous, 0.3-1 cm long, threadlike, either undivided or with 1-2 segments, the margins glabrous; valve-lidded bladders 1-2, borne on the leaves, 1-2 mm wide, these trap small, aquatic animals; winter buds lacking.

Flowers:
Inflorescence of 1-3 flowers in lax racemes at the end of stalks; corollas yellow, the spurs broadly cone-shaped but shorter than the lower lips, the lower lips broad, flat, saddle shaped; bracts without ear-like lobes.

Fruits:
Capsules, stalks erect; seeds winged.