510 ORDER 81. LENTIBULACE^E. 



a Flowers yellow. Loaves (2-rankecl) and bladders on separate branches J&o. 3 



a Flowers yellow. Leaves (capflfaceoiw) beurins; the bladders (b). 



b Spur acute or notched, iibout :is Ions; as the lips Nos. 4 tr> C 



b Spur obtuse, short Flowers of 2 kinds, the lipless down on the stems No. 7 



b Spur obtuse, short. Pedicels all on the scape, erect in fruit Nos. S, 9 



recurved in fruit Nos. 10, 11 



U. inflata Walt. Upper Ivs. in a whorl of 5 or 6 at the surface of the water; 

 petiolo and midveiu inflated, lower Ivs. capiilaoeous, dissected, submerged ; scape 

 4 to 5-flowered. U In ponds, Me. to Fla. W. to Ohio. The proper stetn (rhiz- 

 ome) is very long, branching, suspended ia tho water by innumerable minute air 

 bladders, and the 5 or G involucrate, hollow Ivs , which are many-cleft at the end. 

 Fis. 4 or 5 together upon a scapo 8' ia length, pedunculated, with sheathing 

 bracts. Spur nearly as long as tho corolla, appressed to the lower lip, striate, 

 emarginate. Cor. yellow, tho upper lip broad-ovate, entire, lower 3-lobed, 

 Aug. 



2 U. purptirea Walt. St. long, floating, branched; Ivs. submersed, fibrillous, 

 verticillate, pinnately dissected, segments capillary, utrieuhtc ; scape assurgent, 

 2 3-flowered upper lip roundish-truncate, lower lip larger, its lateral lobes cucul- 

 late, smaller than tho central ; spur conical, flattened, appressed to arid shorter 

 than the upper lip. Pools, Mo. to Fla. W. to Wis. Readily known by the 

 large, bright, purplo fls. Stem 1 3f long. Leaves about 1|' long. \Jtricles 

 small Scape 3 3' high. Corolla 8" broad, tho spur 3", greenish. Aug. 



3 U. intermedia Hay no. Lvs. all submersed, in 2 rows, alternate, dichotom- 

 ously many-parted, segm. rigid, linear-subulate, ciliate-denticulate ; leafless 

 branches bearing all tho bladders and terminal bulblete ; scapes 2 to 3-flowered, 

 upper lip entire, twice as long as tho palate; spur conical, acute; ped. of the 

 fruit erect. Swamps, Can. and N. States to Wis. Scapo 4 to 8' high. Leafy 

 stems 3 to G' long, and tho leaves about 3" (in our specimens). Jn., Jl. 



31 ROBBINSIT. Leaf-segments linear-setaceous, flaccid, entire. 8 to 12" long; 

 scape tall (7 to 12'), 3 to 7-flowered; spur fusiform, acute, nearly as long as 

 the lower lip. Swarsps, Uxbridge, Northbridge, Mass. (Robbins). Quite 

 unlike tho preceding in its leaves and spur. 



4 U. striata Lc Cont?. Lvs. numerously subdivided, submerged, capillary, bear- 

 ing the bladders, or vesicles ; scape 2 G-flowered, with a few scales ; flowers 

 large, upper lip broad, divided into 3 lobes, the middle lobe striate with rtd, lower 

 lip crenate, sides reflexed, having dark spots upon the palate ; spur slender, 06- 

 tttse, with a notch at the end, pressed against tho lower lip of the corolla and 

 nearly as long T) Swamps, L. Isl. to Fla. Root submerged, slightly attached 

 to the mud. Leaves (radicles ?) few, capillary, appcndaged with few air vessels. 

 Scape a foot high, generally with 2 flowers. June. 



5 U. longirostris Ell. Lvs. submersed, diehotomously divided, segm. setace- 

 ous, bearing the vescicles; scapes 1 to 2-flowered; upper lip slightly 3-lobed, 

 lower entire ; spur linear- subulate, ascending, emargliMte at apex, longer than (he 

 lower lip. Stagnant pools, S. Car. to Fla. Scape 3 to 5' high. Fls. yellow, 

 middle size. Jn. 



6 U. biflora Lam. Irregularly whorled, capillaceously divided, root-like, bladder- 

 bearing; scape slender, 2 to 3-flowered, pedicels many times longer than the 

 bract or calyx; spur straight, oblong, acute, appressed to the corolla, and of equal 

 length ; fr. erect. Ditches, S. Car. and Ga Scape 3 to 4' high, pedicels 3 to 4". 

 May, Jn. 



7 U. clandestina Nutt Lvs. all submersed, capillaceous, multifid, bladder- 

 bearing ; fls. 2 or 3 on the slender scape, also solitary on slender, axillary pedi- 

 cels among the Iva. on the stem, the latter apetalous, fertile ; spur very obtuse, 

 shorter than the 3-lobed lower lip. Ponds, Mass. (Robbins) to 2SL J. Sts. almost 

 capillary, G' to 2f long, with many bladders. Scape 3 to 4' high (seldom seen), 

 with corollas expanding about 3 '. Cauline pedicels 6 to 7" long, the cor. tubu- 

 lar, never opening. Jl. 



8 U. gibba L. (and Le Conte). Minute, floating, with hair-like Ivs. and few 

 utricles; scape 1 to 2-flowered, naked; segm. of tho yellow cor. roundish, upper 

 lip emarginate, lower subtrilobate, middle lobe crenate, subrevolute ; spur gibbous 

 (that is), very short and obtuse. If. I Q pools, K. I (Oluey), Mass., N. Y. to 



