LENTIBULARIACE^E. 287 



ORDER XCVI. LENTIBULARIACE^E. BUTTERWORTS. 



Calyx divided, persistent. Corolla irregular, bilabiate, with 

 a spur. Stamens 2, included within the corolla and inserted 

 into its base ; anthers 1-celled. Ovary 1-celled ; style 1 ; stig- 

 ma bilabiate. Capsule 1-celled, many-seeded. Seeds minute, 

 without albumen. Herbaceous plants, growing in water or 

 marshes. Leaves radical, undivided ; or compound, resem- 

 bling roots and bearing little vescicles. 



1. PINGUIGULA. Linn. Butterwort. 

 (From the Latin pinguis,fat; the leaves being thick and greasy to the touch.) 



Calyx 4 5-cleft, unequal. Corolla ringent, spurred at the 

 base beneath. Stamens 2, included; the filaments ascending. 

 Anthers transversely 2-valved.' 



P. vidgaris Linn. : spur cylindric, acute, as long as the veinless petal ; 

 upper lip 2-lobed ; lower one in three unequal obtuse segments. P. acuti- 

 folia Muh. ? 



Wet rocks. Rochester, N. Y. Mich, and Wise. Arct. Amer. April. %. 

 Leaves all radical, spatulate- ovate, fleshy. Scape 4 6 inches high. Flowers 

 solitary, nodding ; tube of the corolla villons, purple. Common Butterwort. 



2. UTRICULARIA. Linn. Bladderwort. 



(From tlie Latin utriculus, a little bladder ; in allusion to the inflated appen- 

 dages attached to the roots.) 



Calyx 2-parted ; lips undivided, nearly equal. Corolla per- 

 sonate, with the lower lip spurred at the base. Stamens 2, 

 with the filaments incurved, bearing the anthers within the apex. 

 Stigma 2-lipped. Capsule 1-celled. 



1. U. ceratophylla Mich.: floating; upper leaves whorled, pinnatifid at 

 the extremities and furnished with air bladders; scape 5 7-flowered; 

 lower lip of the corolla deeply 3-lobed ; spur short, obtuse, deeply emargi- 

 nate. U. injlata Wall. 



Ponds. N. Y. to Mexico; rare. July, Aug. 7J-. Root very long, finely 

 divided and furnished with numerous compressed air vessels. Stem or scape 

 about 8 inches high. Pioneers large, yellow, subcorymbed. 



Spongy-leaved Bladderwort, 



2. U. vulgaris Linn. : floating ; stems submerged, dichotomous ; leaves 

 many-parted, furnished with air bladders; scape 5 9-flowered, bracteate; 

 upper lip of the corolla entire, broad-ovate ; spur conical, incurved. U. 

 macrorhiza Le Conic. 



Pools and ponds of deep water. Can. to Car. W. to the Platte River. July, 

 Aug. 1|.. Root much branched. Scape 810 inches high. Flowers large, 

 racemed. yellow ; spur entire and somewhat attenuated at the apex. 



Common BladdenovrL 



