HO Order 81.— LENTIBULACE^E. 



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



a Flowers yellow. Leaves (eapillaceou.-) bearing the bladders (b). 



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



b Spur obtuse, short. Flowers of 2 kinds, tlie. 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 



TJ. inflata "Walt. Upper lvs. in a whorl of 5 or G at tho surface of the water; 

 petiole and midveiii inflated, lower lvs. capillaoeous, dissected, submerged ; scape 

 4 to 5-flowered. — U In ponds, Me. to Pla. W. to Ohio. Tlio proper stem (rhiz- 

 ome) is very long, branching, suspoude I in tho water by innumerable minute air 

 bladders, and the o or G involucrate, hollow lvs , which are many-cleft at tho end. 

 Pis. 4 or 5 together upon a scapo 8' in longth, pedunculated, with sheathing 

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

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

 Aug. 



2 U. purpurea Walt. JSt. long, floating, branched; lvs. submersed, fibrilloua, 

 vertieillate, pinnately dissected, segments capillary, utrieulate; scape nssurgent, 

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

 Jate, smaller than tho central ; spur conical, flattened, appressed to and shorter 

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

 large, bright, purple fls. Stem 1 — 3f long. Leaves about 1}/ long. Vtricles 

 Bmall. Scape 3 — 5' high. Corolla 8" broad, tho spur 3", greenish. Aug. 



3 U. intermedia Haync. Lvs. all submersed, in 2 rows, alternate, diehotom- 

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

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

 upper lip entire, twice as long* as tho palate; spur con'cal, acute; ped. of the 

 fruit erect. — Swamps, Can. and N. States to Wis. t:'capo 4 to 8' high. Leafy 

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



6? Robbixsii. Leaf-segments linear-setaceous, flaccid, entire. 8 to 12" long; 

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

 the lower lip. — Swarapa, Uxbridge, Northbridgc, Mass. (Robbins). — Quite 

 unlike tho preceding iu it3 leaves and spur. 



4 TJ. striata Le Conte. Lvs. numerously subdivided, submerged, capillar, 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 red, lower 

 lip crenate, sides reflexed, having dark spot3 upon tho palate ; spur slender, ob- 

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

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

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

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



5 TJ. longirostris Ell. Lvs. submersed, dicbotomously divided, segm. setace- 

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

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

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

 middle size. Jn. 



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

 bearing; scapo 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 TJ. 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, 6' to 2f long, with many bladders. Scape 3 to 4' high (seldom seen), 

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

 lar, never opening. Jl. 



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

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

 lip emarginate, lower subtrilobak, middle lobe crenate, subrevolute ; spur gibboua 

 (that is), very short and obtuse. — 2{. In pools, R. I (Olnoy), Mass., N. Y. to 



