PINGUICULACEAE 1091 



3. Utricularia inflata Walt. Stems submersed, often stout, elongated. Leaves 

 dichotomously dissected, copiously bladder-bearing : scapes erect, ernersed, 2-6 dm. tall, 

 bearing near the middle a single whorl of 6-9 conspicuous inflated bracts, which are 

 more or less confluent at the base and pinnately dissected near the tip : racemes 5-12- 

 flowered : pedicels 1-3 cm. long, spreading or recurving in fruit : calyx becoming 4-5 cm. 

 long : corolla yellow, about 2 cm. broad, the upper lip concave, nearly entire, the lower 

 lip 3-lobed, about twice as long as the appressed conic emarginate spur. 



In ponds and ditches, Maine to Florida and Texas. Spring to fall. 



4. Utricularia vulgaris L. Stems submersed, leafy, 3-12 dm. long. Leaves numer- 

 ous, alternate ; blades 2-3-pinnately dissected into filiform segments, usually bearing 

 numerous bladders : bladders when fully developed 3-5 mm. long : scapes erect, 1-3 dm. 

 tall : racemes 5-10-flowered : pedicels 5-15 mm. long, recurving at maturity : calyx becom- 

 ing 3-3.5 mm. long : corolla yellow, 12-15 mm. broad, the upper lip erect, nearly entire, 

 the lower lip spreading, slightly 3-lobed ; spur not appressed, horn-like, slightly curved, 

 shorter than the lower lip : capsules many-seeded. 



In ponds and ditches, throughout Canada and the United States. Also in Europe and Asia. 

 Spring and summer. 



5. Utricularia oligosperma St. Hil. Stems submersed, 9-30 dm. long. Leaves 

 chiefly in alternate pairs, one of each pair much more copiously bladder-bearing, 3-10 cm. 

 long ; blades pinnately 4-5-dissected into very fine or capillary segments, the segments 

 fewer when the bladders are more numerous : bladders 2 mm. long or less : scapes erect, 

 1-3 dm. tall : racemes 10-20-flowered : pedicels 1-2 cm. long, recurving at maturity : 

 calyx becoming 45 mm. long : corolla yellow, 15-20 mm. broad, the upper lip erect, 

 nearly entire, the lower lip spreading, slightly 3-lobed ; spur not appressed, slenderly 

 conic, slightly curved, shorter than the lower lip : capsules few-seeded. 



In ponds, lakes and ditches, Florida to Louisiana. Also in tropical America. 



6. Utricularia Floridana Nash. Similar to the next preceding species. Scapes 

 more or less tortuous, 1.5-4 dm. tall : pedicels erect or ascending at maturity : calyx be- 

 coming 3-4 mm. long : corolla 12-15 mm. broad. 



In ponds, peninsular Florida. Spring to fall. 



7. Utricularia gibba L. Stems radiating from the base of the scape or scapes, sev- 

 eral cm. long, delicate, root-like : leaves scattered, sparingly divided ; segments capillary, 

 with few minute bladders : scapes erect, wire-like, 2-10 cm. tall : flowers 2, or rarely 1-3 

 near the top of the scape : pedicels very slender, erect or ascending : calyx becoming 2-3 

 mm. long : corolla yellow, 5-7 mm. broad ; spur obtuse, shorter than the lower lip. 



In shallow water, New England, Ontario and Missouri to Louisiana and Florida. Summer. 



8. Utricularia biflora Lam. Similar to the next preceding species. Corolla about 

 10 mm. broad ; spur subulate, about as long as the lower lip. 



In shallow water, Massachusetts to Illinois, Florida and Texas. Spring to fall. 



9. Utricularia fibrosa Walt. Stems radiating from the base of the scape or scapes, 

 often 1-2 dm. long and free-swimming at the tip. Leaves numerous ; blades 2-3-dichot- 

 omously dissected, or the bladder-bearing ones much reduced : scapes erect, slender, 1-3 

 dm. tall : racemes 2-5-flowered, usually 3-flowered : pedicels ascending, 5-20 mm. long : 

 calyx becoming 2-3 mm. long : corolla yellow, about 15 mm. broad ; lips nearly equal ; 

 spur linear, appressed, about as long as the lower lip, obtuse or emarginate at the apex. 



In and about ponds, chiefly in pine lands, New York to Florida and Louisiana. 



10. Utricularia macrorhyncha Barnhart. Stems radiating from the base of the 

 scape or scapes, short, root-like. Leaves few ; blades mostly bladder-bearing and much 

 reduced : scapes erect, slender, 5-10 cm. tall : racemes 1-3-flowered, usually 2-flowered : 

 calyx becoming 2 mm. long : corolla yellow, about 10 mm. broad ; lips nearly equal ; spur 

 slenderly conic, appressed, longer than the lower lip, obtuse or emarginate at the apex. 



In shallow water, Georgia, Florida and Alabama. 



11. Utricularia resupinata B. D. Greene. Stems radiating from the base of the 

 scape or scapes, short, root-like. Leaves scattered ; blades simple or forked near the base ; 

 segments slender, capillary, often bladder-bearing : scapes erect, 2-5 cm. tall : flowers soli- 

 tary : calyx becoming 1.5-2 mm. long : corolla violet-purple, 6-10 mm. long, reflexed so 

 that it rests transversely on the top of the scape ; spur conic, obtuse, shorter than the rest 

 of the corolla, distant from the lower lip, with which it is parallel. 



In sandy swamps and shallow ponds, Maine to Michigan and Florida. Spring to fall. 



12. Utricularia subulata L. Stems, leaves and bladders minute and delicate, evanes- 

 cent. Scapes rooting in mud, filiform, bronze-colored, 2-20 cm. tall : racemes 1-9-flowered : 

 rachis becoming zigzag when well-developed : pedicels ascending, 2-10 mm. long, surpass- 



