eiO Ordee 81.— LENTIBULACBjE. 



a Flowei'3 yellow. Leavca (2-ranked) and bladders on separate branches JTo. 3 



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



b Spur acute or notched, about as lung .is the lips Nos. 4 to fl 



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



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



— recurved in fruit Nos. 10, II 



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

 petiole and midvein inflated, lower Iva. oapillaoeoua, dissected, submerged ; scape 

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

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

 bladders, and the 5 or 6 iuvolucrate, 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 aa the corolla, appressed to the lower lip, striate, 

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

 Aug. 



2 TT. purpiirea Tv'alt. St. long, floating, branched ; Ivs. submersed, flbi'iUous, 

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

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

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

 than the upper lip. — (J) Pools, Me. to Pla. "VT. to Wis. Eeadily known by the 

 large, bright, purple fls. Stem 1 — 3f long. Leaves about 1J-' long. "Utricles 

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



3 U. intemiddia Hayno. Lvs. all submersed, in 2 rows, alternate, dichotom- 

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

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

 upper lip entire, twice aa long aa the palate ; apur conical, acute ; ped. of the 

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

 sterna 3 to 6' long, and the leaves about 3" (in our specimens). Jn., Jl. 



81 EoEEiNSli. Leaf-segments linear-setaceoua, flaccid, entire, 8 to 12" long; 

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

 the lower lip. — Swamps, tJxbridge, Northbridge, Masa. (Robbins). — Quite 

 unlike the preceding in its leaves and spur. 



4 U. striata Le Conte. 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 loies, the middle lobe striate with red, lower 

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

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

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

 to the mud. Leaves (radicles 7) few, capillary, appendaged with few air vessels. 

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



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

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

 lower entire ; spur linear- suiulate, ascending, emarginate at apex, longer than Vie 

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

 middle size. Jn. 



6 IT. biflora Lam. Irregtilarly whorled, oapUlaceously divided, root-like, bladder- 

 bearing ; scape slender, 2 to 3-fiowered, pedicels many timea longer than the 

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

 length; fr. erect. — Ditchea, S. Car. and Ga. Scape 3 to 4' high, pediccla 3 to 4". 

 May, Jn. 



7 TT. cland6stina 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 lvs. on the stem, the latter apetalous, fertile ; spur very obtuse, 

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

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

 with corollas expanding about 3''. Cauhno pedicels G to 1" long, the cor. tubu- 

 lar, never opening. JL 



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

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

 Up emarginate, lower subirilohate, middle lobe crenato, subrevolute ; spur gibbous 

 (that is), very short and obtuse. — 4 I^ pools, R. I (Olnoy), Mass., N. Y. to 



