318 LENTIBULACE^. (BLADDERWORT FAMILY.) 



free : style very short or none : stigma 1 - 2-lipped, the lower lip larger 

 and with a prominent palate. Pod often bursting irregularly. Scapes 

 1- few-flowered. Consists mostly of the two following genera: 



1. UTB-ICULABIA, L. BLADDERWORT. 



Lips of the 2-parted calyx entire, or nearly so. Corolla personate, the palate 

 on the lower lip projecting, often closing the throat. Anthers convergent. 

 Aquatic and immersed, with capillary dissected leaves bearing little bladders, 

 which are filled with air and float the plant at the time of flowering ; or rooting 

 in the mud, and sometimes with few or no leaves or bladders. Scapes 1 - few- 

 flowered ; usually flowering all summer. (Name from utriculus, a little bladder.) 



* 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 little bladders: rootlets few or none. 



1. IT. inflata, Walt. (INFLATED BLADDERWORT.) Swimming free; 

 bladder-like petioles oblong, pointed at the ends, and branched near the apex, 

 bearing fine thread-like divisions; flowers 5-10 (large, yellow) ; the appressed 

 spur half the length of the corolla; styk distinct. Ponds, Maine to Virginia, 

 and southward, near the coast. 



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



which commonly swim free, and bear capillary dissected leaves furnished with 

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

 perennial, propagated from year to year by a sort of buds.) 

 *- Flowers all alike, yellow, several in a raceme: pedicels nodding in fruit. 



2. 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 Var. AMERICANA 

 (U. macrorhiza, LeConte), less thick and rather acute. Common in ponds and 

 slow streams. (Eu.) 



3. IT. minor, L. (SMALLER B.) Leaves scattered on the thread-like im- 

 mersed stems, 2-4 times forked, 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, Rhode Island to Illinois and north- 

 ward. Corolla 2" - 3" broad. (Eu. ) 



i- 1- Flowers of 2 sorts; viz. the usual sort (3 - 7) in a raceme, their pedicels ascend- 

 ing, the corolla yellow ; and more fertile ones solitary and scattered along the leafy 

 stems, on short soon reflexed peduncles, fruiting in the bud, the corolla minute and 

 never expanding. 



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

 stems, several times forked, capillary, copiously bladder-bearing ; scapes slen- 

 der (3' -5' high) ; lips of the corolla nearly equal in length, the lower broader 

 and 3-lobed, somewhat longer than the approximate thick and blunt spur. 

 Ponds, E. New England, W. New York, and New Jersey. 



