LENTIBULACE^. (bLADDEEWORT FAMILY.) 319 



-I- H- -t- Flowers all alike, few (1 -5) ; pedicels erect in fruit. 

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



5. U. intermfedia, 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, appressed 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. XJ. 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' - 1 2' high. 



7. U. biflbra, Lam. Scape (2'-5' high) 1-3-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 and southward. 



8. TJ. gibba, L. Scape (1' -3' high), \-2-flojpered, 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 toer with the sides reflexed (i'l-f)'' long), exceeding the very thick 

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

 New York and N. Illinois. 



++ +♦ 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. (IT. sacckta, 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. 



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



10. U. resupin&ta, 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 

 fi-om it, both ascending, the flower resting transversely on the summit of the scape. 

 — Sandy margins of ponds, E. Maine to Ehode Island. 



■1- ■*- Flowers 2-10, (chiefly) yellow: leaves entire, rarely seen. 



11. U. eorntlta, 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, 



