LENTIBULACE^E. (BLADDERWORT FAMILY.) 319 



■*-•«- 4- 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, 

 '^-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, appressed to the very broad (&'' -8") lower tip and nearly as long 

 us 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 ($" 

 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. biflora, Lam. Scape (2' -5' high) 1 -3-filowered, 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 and southward. 



8. U. gibba, L. Scape (V -3' high), 1 - 2-flowered, at the base furnished 

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

 ieaves 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. 



++ ++ Corolla violet-purple. 



9. U. purpurea, 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 

 commonly none. 



*- 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 ponds, E. Maine to Rhode Island. 



•*- +- Flowers 2-10, [chiefly) yellow: leaves entire, rarely seen. 



11. U. cornuta, 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, 



