LENTIBULAEIACEAE (BLADDER WOET EAMILY) 737 



U. vulg. V. amer. 



897. U. minor. 



scapes slender, 1 dm. high ; lips of the yellow- corolla nearly equal in length, 

 the lower broader and 3-lobed, somewhat longer than the approximate thick 

 and blunt spur. — Ponds, N. B. to Del. and Pa., chiefly near the coast. July, 

 Aug. Fig. «96. 



-1- +- No cleistogamous flowers. 

 •M- Pedicels reciirved in fruit ; corolla yelloio. 



?>. U. vulgaris L. (Greater B.) Immersed stems 

 3-10 dm. long, crowded with 2-3-pinnately many-parted 

 capillary leaves bearing many bladders; scapes 5-12- 

 flowered, 1-3 dm. long ; corolla closed, 1-2 cm. hroad, 

 the sides reflexed ; spur conical, rather shorter than the 

 lower lip, thick and hlunt. — Eurasia; n. w. Am 

 Represented with us by 



Var. americSna Gray. Spur more slender and rather acute. — Common ir 

 ponds and slow streams, Nfd. to Minn., s. to Va. and Tex., and 

 westw. June-Aug. Fig. 896. 



4. U. minor L. (Smaller B.) Leaves scattered.on the thread- 

 like immersed stems, 2-4 times forked, short ; scapes weak, 2-8- 

 flowered, 0.5-2 dm. high ; npper lip of the gaping corolla not 

 longer than the depressed palate ; spur very short and blunt, or 

 almost none. — Shallow water, e. Que. to B. C, s. to N. J., w. 

 N. Y., Great L. region, Utah, and Cal. May-July. (Eu.) Fig. 

 897. 



++ ** Pedicels erect in fruit, few and slender; corolla yellow. 



5. U. glbba L. Scape 2.5-10 cm. high, \-'2.-flowered, at base 

 furnished with very slender short branches, bearing sparingly dis- 

 sected capillary root-like leaves and scattered bladders ; corolla 

 6-8 mm. broad, the hps broad and rounded, nearly equal; the 

 lower lip with the sides reflexed, exceeding and approximate to the 

 very thick and hlunt conical gibbous spur. — Shallow water. Me. 

 ^ .,, to Fla. and Ala., near the coast ; and from w. Vt. to Ont., 111., and 

 8. U. glbba. ,, jyiinn,.! juiy_Sept. Fig. 898. 



6. TJ. biflbra Lam. Scape 0.6-1.3 dm. high, 1-3-ftowered, at the base bearing 

 somewhat elongated submersed branches with capillary root-like leaves and 

 numerous bladders ; corolla 8-13 mm. broad, the spur 

 oblong, equaling the lower lip ; seeds scale-shaped. — 

 Ponds and shallow waters, Mass. to Fla.; and from 

 Wise, and Minn, to Ala. and Tex. Aug., Sept. Fig. 

 899. 



7. U. fibrbsa Walt. Leaves crowded or whorled on 

 the small immersed stems, several times forked, capil- 

 lary ; the bladders borne mainly along the stems ; flowers 

 2-6, 1-1.3 cm. broad; lips nearly equal, broad and ex- 

 panded, the upper undulate, concave, plaited-striate in 

 the middle ; spur nearly linear, obtuse, approaching and 

 almost equaling the lower lip. — Shallow pools in pine 

 barrens, L. I. and N. J. to Fla. and Ala. May-July. 



8. U. intermedia Hayne. Leaves crowded on the im- 

 mersed stems, 2-ranked, 4-5 times forked, rigid, the divi- 

 sions linear-awl-shaped, minutely bristle-toothed along the 

 margins ; the bladders borne on separate leafless branches; 

 upper lip of corolla much longer than the palate ; spur 

 conical-subulate, acute, appressed to and nearly as long as 

 the very broad (1-1.6 cm.) lower lip. — Shallow pools and 

 streams, Nfd. to B. C, s. to N. J., Pa., Great L. region, 

 900. IT. Intermedia. ja., and Cal. May-July. (Eurasia.) Fig. 900. 



4H. *+ +* Pedicels erect/ in fruit, rather long ; corolla violet-purple. 



J. U. purpurea Walt. Leaves whorled along the long immersed free-floating 



gray's juanl.u< — 47 



U. biflora. 



