Genus 3. 



BLADDERWORT FAMILY. 



227 



floats; pedicels from the axils of basally inserted but sometimes auriculate bracts, without 

 bractlets. Calyx 2-lobed, the lobes concave, herbaceous, usually spreading under the mature 

 capsule. Corolla strongly 2-lipped, the palate at the base of the lower lip, prominent, usually 

 2-lobed. Anthers not lobed. Capsule few-many-seeded. Seeds more or less peltate, flat- 

 topped, the margin variously winged or wingless. [Latin, utriculus, a little bag.] 



About 75 species, of world-wide distribution. Besides the following, 2 or 3 others occur in 

 the southeastern United States. Type species : Utricularia vulgaris L. 



Scape without floats. 



Stems creeping on the bottom in shallow water; some or all of the leaves root-like. 

 Spur and palate conspicuous ; pedicels ascending in fruit. 



Segments of leaves all capillary ; lips of corolla nearly equal in length. 



Spur stout, conic, shorter than the lower lip. 1. U.gibba. 



Spur slender, equalling or exceeding the lower lip. 



Spur tapering from base to apex ; leaves all alike, bladder-bearing ; scapes 2's' 



high. 2. U. pumila. 



Spur conic at base, linear above; leaves not all bladder-bearing; scapes 4'-i6' 

 High. 3- U. fibrosa. 



Segments of some leaves linear, flat, bristly-serrulate ; upper lip of corolla about half 



U. intermedia. 

 U. minor. 



7. U. macrorhiaa. 



U. radiata. 

 U. inflata. 



^L 



length of lower lip. 

 Spur a mere sac ; palate obsolete ; pedicels recurved in fruit. 

 Stems free-floating, except for a single point of attachment. 



Scapes 2-5-flowered, without scales; cleistogamous flowers also present. 6. U.geminiscapa. 

 Scapes 6-20-flowered, with 1-5 scales; cleistogamous flowers none. 

 Scape with a whorl of more or less united, conspicuous, inflated floats. 

 Scape from floats to lowest pedicel 2' long or less ; corolla 6"-q" long. 

 Scape from floats to lowest pedicel 3' long or more ; corolla io"-i2" long. 



i. Utricularia gibba L. Humped or Swollen- 

 spurred Bladdervvort. Fig. 3861. 



Utricularia gibba L. Sp. PI. 18. 1753. 



U. fornicata LeConte, Ann. Lye. N. Y. 1 : 76. 1824. 



Stems creeping on the bottom in shallow water, 

 radiating from the base of the scape ; leaves alter- 

 nate, mostly once or twice dichotomous, the seg- 

 ments few, capillary, bladder-bearing. Scapes soli- 

 tary, f-4' high, 1-3-flowered, with I scale or none ; 

 pedicels l"-5" long, erect-ascending; calyx-lobes 

 i"-lj" long; corolla yellow, the upper lip subtrian- 

 gular, 2"-3" long, 3"-4" broad, the lower about 3" 

 long and broad, the palate prominent. 2-lobed ; spur 

 conic, very obtuse, shorter than the lower lip ; cap- 

 sule globose, li"-2" in diameter. 



In shallow water, Maine to Michigan, south to Flor- 

 ida and Texas. June-Sept. 



2. Utricularia pumila Walt. Two-flowered 

 Bladderwort. Fig. 3862. 



Utricularia pumila Walt. Fl. Car. 64. 1788. 



Utricularia bifiora Lam. 111. 1 : 50. 1791. 



U. longirostris LeConte; Ell. Bot. S. C. & Ga. 1 : 21. 



1S16. 

 U. macrorhyncha Barnh. Bull. Torr. Club 25: 515. 



1 89 8. 



Stems creeping on the bottom in shallow water, 

 radiating from the base of the scape; leaves 

 alternate, dichotomously divided, the segments 

 capillary, bladder-bearing. Scapes solitary or two 

 together, 2-5' high, 1-4-flowered. with 1-3 scales 

 or none; pedicels 2i"-8" long, erect-ascending; 

 corolla yellow, the upper lip more or less 3-lobed, 

 4"-S" long, 6"-y" broad, the lower 4"-s" long 

 and broad, the palate prominent, 2-lobed; spur 

 slenderly conic or subulate, obtuse or emarginate, 

 equalling or usually exceeding the lower lip; 

 capsule globose, I J" in diameter. 



In shallow water, Massachusetts to Florida and 

 Louisiana, near the coast. July-Aug. 



