510 ORDER 81. LENTIBULACE^E. 



a Flowers yellow. Leaves (2-ranked) and bladders on separate branches .No. 8 



a Flowers yellow. Leaves (capillaceous) bearing the bladders (b). 



b Spur acute or notched, about as long as the lips Nos. 4 to 6 



b Spur obtuse, short. Flowers of 2 kinds.4.he lipless down on the stems No. 7 



b Spur obtuse, short. Pedicels all on the scape, erect in fruit Nos. 8, 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 ; 

 petiole and midvein inflated, lower Ivs. capillaoeous, dissected, submerged ; scape 

 4 to 5-flowered. If In ponds, Me. to Fla. "W. to Ohio. The proper stem (rhiz- 

 ome) is very long, branching, suspended in the water by innumerable minute air 

 bladders, and the 5 or 6 involucrate, hollow Ivs., which are many-cleft at the end. 

 Fls. 4 or 5 together upon a scape 8' in length, pedunculated, with sheathing 

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

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

 Aug. 



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

 verticillate, piunately dissected, segments capillary, utriculate; scape assurgent, 

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

 late, smaller than the central; spur conical, flattened, appressed to and shorter 

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

 large, bright, purple fls. Stem, 1 3f long. Leaves about !' loug. Utricles 

 small Scape 3 5' high. Corolla 8" broad, the spur 3", greenish. Aug. 



3 U. intermedia Hayne. Lvs. all submersed, in 2 rows, alternate, dichotom- 

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

 branches bearing all the bladders and terminal bulblets ; scapes 2 to 3-flowered, 

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

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

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



81 ROBBIXSII Leaf-segments linear-setaceous, flaccid, entire, 8 to 12" long; 

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

 the lower lip. Swamps, Uxbridge, Northbridge, Mass. (Robbius). Quite 

 unlike the preceding in its leaves and spur. 



4 U. Btriata Le Corite. Lvs. numerously subdivided, submerged, capillary, bear- 

 ing the bladders, or vesicles ; scape 2 6-flowered, with a few scales ; flowers 

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

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

 tuse, with a notch at the end, pressed against the 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, appendaged wi.th few air vessels. 

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



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

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

 lower entire ; spur linear -subulate, ascending, emarginate at apex, longer than the 

 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. clandestiiia 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 Ivs. on the stern, the latter apetalous, fertile ; spur very obtuse, 

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

 capillary, 6' 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 the yellow cor. roundish, upper 

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

 (that is), very short and obtuse. 4 In pools, R. I. (Olney), Mass., N. Y. to 



