LENTIBULARIACE^. 287 



Order XCVI. LENTIBULARIACE^.— Butterworts. 



Calyx divided, persistent. Corolla irregular, bilabiate, Avitli 

 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. i.m?i.— 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. vulgaris Linn. : spur cylindric, acute, as long as the veinless petal ; 

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

 folia Mich. 7 



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 villous, purple. Common Butterwort. 



3. UTRICULARIA. ■ i>mw,— Bladderwort, 



(From the Latin utriculus, a Utile 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 Walt. 



Ponds. N. Y. to Mexico; rare. July, Aug. 1|.. — Root very long, finely 

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

 about 8 inches high. Flowers 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, incui;ved. U. 

 macrorhiza Le Conte. 



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

 Aug. %.—Root much branched. Scape 8 — 10 inches high. Flowers large, 

 raccmed, yellow ; spur entire and somewhat attenuated at the apex. 



Common Bladderwort. 



