Creeping stems delicate, seldom over 10 cm, forming mats near the bottom in shallow water; lvs scattered, rarely over 5 mm, commonly once (twice) forked, with a few bladders; flowering branches 5-10 cm, with 1-3 yellow fls 5-6 mm; palate prominent; spur very thick and obtuse, only ca half as long as the lower lip. Shallow water; Que. to Wis., s. to Fla. and La.; also Pacific states, W.I., and c. Amer.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Much like no. 13 [Utricularia fibrosa Walter]; vegetative stems all alike; lvs very delicate, rarely over 5 mm, usually twice-forked; flowering branches 5-12 cm; pedicels to 15 mm; fls 1-4. Shallow water on the coastal plain; e. Mass. to Fla. and Tex., n. to Okla. July, Aug.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Stems creeping and forming tangled mats near the bottom in shallow water, radiating from the base of the scape, dimorphic, some with rather crowded, thrice-forked, bladderless lvs to 15 mm, the others with smaller, twice-forked lvs bearing numerous bladders; flowering branches 1.5-4 dm, with 2-6 long-pediceled fls; cor yellow, the lower lip 8-10 mm, with prominent palate; spur equaling or slightly exceeding the lip. Shallow ponds on the coastal plain; e. Mass. to Fla. and Tex., n. in the interior to Ark. and Okla. June-Aug. (U. pumila)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.