LENTIBULACEJE. (BLADDERWORT FAMILY.) 319 



4- i- - Flowers all alike, few (1-5): pedicels erect in fruit. 

 ++ Corolla yellow : scape and pedicels filiform : spur ascending or horizontal. 



5. U. intermedia, Hayne. Leaves crowded on the immersed stems, 

 2-ranked, 4-5 times forked, rigid ; the divisions linear-awl-shaped, minutely 

 bristle-toothed along the margins, not bladder-bearing, the bladders being on sep- 

 arate leafless branches ; upper lip of the corolla much longer than the palate ; spur 

 conical-oblong, acute, oppressed to the very broad (6" - 8") lower lip and nearly as long 

 as it. Shallow pools, New England and New Jersey to Ohio, Wisconsin, and 

 northward. Leafy stems 3' - 6' long. Scapes 3' - 7' high. (Eu.) 



6. U. Striata, LeConte. Leaves crowded or whorled on the small im- 

 mersed stems, several times forked, capillary, bladder-bearing; flowers 2-5 (6" 

 broad), on long pedicels ; lips of the corolla nearly equal, broad and expanded; 

 the upper undulate, concave, plaited-striate in the middle; spur nearly linear, 

 obtuse, approaching and almost equalling the lower lip. Shallow pools in pine bar- 

 rens, Long Island, New Jersey, and southward. Scape 8'- 12' high. 



7. U. biflbra, Lam. Scape (2' -5' high) l-3-flowered, at the base bear- 

 ing somewhat elongated submersed branches with capillary root-like leaves and 

 numerous bladders ; spur oblong, equalling the lower lip ; seeds scale-shaped ; other- 

 wise resembles the next. Shallow water, Illinois ana southward. 



8. U. gibba, L. Scape (l'-3'high), l-2-Jtowered, at the base furnished 

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

 leaves and scattered bladders ; lips of the corolla broad and rounded, nearly 

 equal; the lower with the sides reflexed (4" -5" long), exceeding the very thick 

 and blunt conical gibbous spur. Shallow water, Virginia to Massachusetts, N. 

 New York and N. Illinois. 



w- *+ Corolla violet-purple. 



9. U. purptirea, Walt. ? Leaves whorled along the long immersed free 

 floating stems, petioled, decompound, capillary, bearing many bladders ; flowers 

 2-4 (6" wide) ; spur appressed to the 3-lobed 2-saccate lower lip of the corolla 

 and about half its length. (U. saccata, LeConte.) Ponds, Maine to Virginia, 

 and southward. Scape 3' - 6' high, not scaly below. 



* * * Scape solitary, slender and naked, or with a few small scales, the base rooting 

 in the mud or soil: leaves small, awl-shaped or grass-like, often raised out of the 

 water, commonly few or fugacious: air-bladders few on the leaves or rootlets, or 



-t- Flower purple, solitary: leaves bearing a few delicate lobes. 



10. U. resupinata, Greene. Scape (2' -8' high) 2-bracted above; leaves 

 thread-like, on delicate creeping branches ; corolla (4" - 5" long) deeply 2-parted ; 

 spur oblong-conical, very obtuse, shorter than the dilated lower lip and remote 

 from it, both ascending, the flower resting transversely on the summit of the scape. 

 Sandy margins of pends, E. Maine to Rhode Island. 



H- *- Flowers 2-10, (chiefly) yelloiv: leaves entire, rarely seen. 



11. U. COrntlta, Michx. Stem strict (3'-l high), 2-10-flowered; ped- 

 icels not longer than the calyx ; lower lip of the corolla large and helmet-shaped, its 

 centre very convex and projecting, while the sides are strongly reflexed ; upper 

 lip obovate and much smaller ; spur awl-shaped, turned downward and outward, 



