396 LENTIBULARIACE^E. (BLADDERWORT FAMILY.) 



* Upper leaves in a whorl on the otherwise naked scape, floating by means of 



large bladders formed of the inflated petioles; the lower leaves dissected 

 and capillary, bearing small bladders ; rootlets few or none. 



1. U. inflata, 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, which commonly swim free, bearing capillary dissected leaves with 

 small bladders on their lobes ; roots few and not affixed, or none. (Mostly 

 perennial, propagated from year to year by tuber-like buds.) 



1- 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. 



-i- - No cleistogamous flowers. 

 -* 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 bluut 

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

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

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



4. U. minor, L. (SMALLER B.) Leares scattered on the thread-like 

 immersed stems, 2-4 times forked, short; scapes weak, 2-8-flowered (3-7' 

 high) ; upper Up 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. (Eu.) 



M- -M- Pedicels erect in fruit, few and slender; corolla yellow. 



5. U. gibba, L. Scape (1 - 3' high) 1 - 2-flowered, 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, exceeding 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 -3-flowered, at the 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 Barnstable, Mass. ( W. Deane). 



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

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

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



