896 LENTIBULARIACE^. (bLADDERWORT FAMILY.) 



* Upper leaves in a whorl on the otherwise naked scape, floating by meant j/ 



large bladders formed of the inflated petioles; the loiver leaves dissec ^d 

 and capillari/, bearing small bladders; rootlets few or none. 



1 . U. inilatSl, Walt. Swimming free ; bladder-like petioles oblong, 

 pointed at the ends and branched near the apex, bearing fine thread-like 

 divisions; flowers 3- 10 (large, yellow) ; the appressed spur half the length 

 of the corolla ; style distinct. — In still water, Maine to Tex., near the coast. 



* * Scapes naked {except some small scaly bracts), from immersed branching 



stems, ichich commonly swim free, bearing capillary dissected leaves with 

 small bladders on their lobes ; roots few and not affixed, or none. [3Iostlt/ 

 perennial, pro [jag ated from year to year by tuber-like buds.) 



H- Cleistogamous flowers along the submersed copiously bladder-bearing stems. 



2. U. clandestina, Nutt. Leaves numerous on. the slender immersed 

 stems, several times forked, capillary ; scapes slender (3 - 5' high) ; lips of the 

 yellow corolla nearly equal in length, the lower broader and 3-lobed, some- 

 what longer than the approximate thick and blunt spur. — Ponds, from N. 

 Brunswick and N. Eng. to N. J., near the coast. 



■1- -t- No cleistogamous fowers. 

 ++ Pedicels recurved in fruit ; corolla yellow. 



3. U. vulgaris, L. (Greater Bladderwort.) Immersed stems (1-3° 

 long) crowded with 2-3-pinnately many-parted capillary leaves, bearing many 

 bladders ; scapes 5 - 12-flowered (6-12' long) ; corolla closed (6-9" broad), the 

 sides reflexed ; spur conical, rather shorter than the lower lip, thick and blunt 

 in the European and the high northern plant ; in the common American plant 

 less thick and rather acute. — Common in ponds and slow streams, Xewf . to 

 Minn., south to Va. and Tex., and westward. (Eu., Asia.) 



4. U. minor, L. (Smaller B.) Leaves scattered on the thread-like 

 immersed stems, 2 - 4 times /or^-erf, short; scapes weak, 2-8-flowered (3-7' 

 high) ; upper lip of the gaping corolla not*longer than the depressed palate ; spur 

 very short and blunt, or almost none. — Shallow water, E. Mass. to Minn., south 

 to N. J. and Ark., and westward. (Eii.) 



•^ ++ Pedicels erect in fruit, few and slender ; corolla yellow. 



5. U. gibba, L. Scape (1 - 3' high) 1 - 2-fowered, at base furnished 

 with very slender short branches, bearing sparingly dissected capillary root- 

 like leaves and scattered bladders; corolla 3-4" broad, the lips broad and 

 rounded, nearly equal ; the lower with the sides reflexed, excreding and ap- 

 proximate to the very thick and blunt conical gibbous spur. — Shallow water. 

 Mass. to Mich., south to Va. and 111. ; Mt. Desert [F. M. Day). 



6. U. biflora. Lam. Scape (2-5' high) 1 -^-flowered, at tlie base bear- 

 ing somewhat elongated submersed branches with capillary root-like leaves 

 and numerous bladders ; corolla 4-6" broad, the spur oblong, equalling the lower 

 lip ; seeds scale-shaped. — Ponds and shallow waters, S. 111. and Iowa to Tex. ; 

 also S. Va. (?), and Barnsta1)le, Mass. ( \V. Deane). 



7. U. fibrbsa, Walt. Leaves crowded or whorled on the small immersed 

 stems, several times forked, capillary ; the bladders borne mainly along the 

 stems; flowers 2-6 (6" broad); lips nearly equal, broad and expanded, the 



