Utricularia vulgaris L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Submersed, free-floating; lvs numerous, 1–5 cm, mostly 2-parted at base and then repeatedly and unequally (quasipinnately) dichotomous, the segments terete, progressively narrower, the ultimate ones filiform and strongly acuminate; bladders numerous, on the lvs; peduncles emergent, 6–20 cm, with 1–several scattered bracts below the infl; fls mostly 6–20 in a lax raceme, yellow, the lower lip mostly about equaling the upper, slightly lobed, 1–2 cm, with well developed palate; spur falcate, directed forward, two-thirds as long as the lower lip; pedicels arcuate- recurved in fr; 2n=44. Quiet water; circumboreal, s. to Fla. and Calif. June–Aug. (U. macrorhiza)