Distribution: Widely distributed throughout Washington; widely distributed throughout North America; circumboreal
Habitat: Lakes, ponds, swamps, and slow-moving streams.
Conservation Status: Not of concern
Submersed, free-floating plants, the stems relatively coarse, 1 mm. or more thick
Leaves alternate, numerous, 1-5 cm. long, 2-parted at the base, then repeatedly and unequally dichotomous, the segments terete, progressively more slender, the ultimate ones filiform and acuminate; bladders numerous, borne on the leaves, 1-3 mm. wide.
Flowers 6-20 on a lax raceme at the end of a stout, emergent peduncle 6-20 cm. long; calyx deeply 2-lobed, the lobes entire; corolla bilabiate, yellow, the proper tube very short, the lower lip 1-2 cm. long, broad, slightly lobed, the base raised; upper lip about equal to the lower, shallowly notched; spur well developed, curved forward; stamens 2, ovary superior.
Capsule on a recurved pedicle.