topped by the bracts; corolla 1-1.5 cm. high, to 1 cm. broad; the lower lip 

 obovate, consisting mostly of the high-arched palate, without broad recurving 

 margin; spur 5-7 mm. long; fruiting calyx 5-7 mm. long. 



In wet sand and on margin of ponds and streams in s.e. Tex., May-Sept.; from 

 Fla. to e. Tex., n. to L.I.; also W.I. and S.A. 



4. Utricularia purpurea Walt. Purple bladderwort. Fig. 711. 



Stems submersed, to about 1 m. long; leaves numerous, in whorls of 5 to 7 

 separated by internodes to 5 cm. long, verticillately branched into filiform seg- 

 ments that often bear a terminal bladder; scape to 15 cm. long, 1- to 4-flowered; 

 corolla about 1 cm. long, rose-purple to violet, the upper lip flat or concave, the 

 lower lip adorned with a yellow spot at base, 3-lobed with the lateral lobes 

 strongly and separately elevated at base into a palate; spur shorter than lower lip 

 and appressed to it. Vesiculina purpurea (Walt.) Raf. 



In pools and lakes of quiet water, s.e. Tex. (Hardin Co.), May-Sept.; from Que. 

 and N.S. to Minn, and n. Ind., s. along the Coastal Plain to Fla., La. and Tex.; 

 also W.I. 



5. Utricularia inflata Walt. Floating bladderwort. Fig. 712. 



Plants free-floating, the elongated submersed stems with alternate leaves that 

 are 4 to 6 times dichotomous into delicate capillary segments and bearing small 

 ovoid bladders; scape supporting a whorl of 4 to 10 leaves that have inflated 

 petioles which serve as floats, from the whorl of floats to the lowest pedicel 7-25 

 cm. long, supporting as many as 14 (usually about 8) flowers; floats 4-9 cm. 

 long, the petiole 4-8 mm. thick, the basal divisions of their pinnately dissected 

 blades 0.5 mm. or more in diameter; floral bracts 3-4 mm. long; calyx lobes 4-7 

 mm. long; corolla yellow, about 2 cm. broad, to 25 mm. high, the lower lip 

 3-lobed and twice as long as the appressed spur; fruiting pedicels to 35 mm. long, 

 spreading or recurved. 



In ditches, swamps, slow streams, lakes and ponds in e. Tex., Mar.-July; from 

 Fla. to Tex., n. to Del. and N.J. 



6. Utricularia radiata Small. Fig. 712. 



Very similar in habit to U. inflata; floats several, 2-5.5 cm. long, with inflated 

 petioles 2-4 mm. thick; peduncle 1.5-5 cm. long, supporting usually 3 or 4 

 flowers; calyx lobes 3-4 mm. long; corolla about 15 mm. broad; fruiting pedicels 

 1-2 cm. long. U. inflata var. minor Chapm. 



In lakes, ditches, slow streams and ponds in e. Tex., Mar. -June; Fla. to Tex., 

 n. to N.S., Tenn. and Ind. 



7. Utricularia vulgaris L. Common bladderwort. Fig. 713. 



Plants rather coarse, with elongated stems to 2 m. long and 0.5 mm. or more 

 thick that are free-floating just beneath the surface of the water, the plumose 

 branches of foliage to 12 cm. in diameter; leaves elliptic to ovate-elliptic, to 

 4 cm. long, much-dissected, the coarser capillary segments slightly less than 1 mm. 

 thick, the numerous bladders large; scape erect, stoutish, to about 8 dm. high, 

 supporting as many as 20 flowers, naked at the base or producing slender small- 

 leaved stolonlike divergent offshoots; bracts 3-6 mm. long; corolla yellow, with 

 brown or orange vertical stripes on the large conspicuous palate, 15-25 mm. 

 high, the broad lower lip somewhat 3-lobed and slightly shorter than the curved 

 obtuse or acutish conical spur; fruiting raceme elongate, the arched-recurved 

 pedicels to about 2 cm. long; winter buds ellipsoid, 1-2 cm. long, their crowded 

 leaves hairy; seeds brown, lustrous, striate-reticulate. Incl. var. americana Gray, 

 U. macrorhiza Le Conte. 



1519 



