A GUIDE AND KEY TO AQUATIC PLANTS 137 



LENTIBULARIACEAE Bladderwort family 



1. Utricularia L. 



1 . Stems erect from base, definitely anchored in substra- 2. 



tum; leaves and bladders rarely seen. 



1. Stems mostly drifting free in water; leaves dissected 3. 

 and bladder bearing. 



2. Flowers yellow 1. U. cornuia. 



2. Flowers purple 2. U. resupinata. 



3. Flowers purple ^ 3. U. -purpurea. 



3. Flowers yellow 4. 



4. Scape with a conspicuous whorl of inflated 4. U. inflata. 

 floats at base. 



4. Scape without a whorl of floats 5. 



5. Scape usually with 5-25 flowers, stout, over 10 cm. high, 6. 



5. Scape usually with 1-2 flowers, slender, less than 10 cm. 8. 

 high. 



6. Leaves forked and each fork 2-3 times divided; 7. 



flowers 12-15 mm. broad. 



6. Leaves forked and each fork 4-5 times dissected; 5. U. foliosa. 

 flowers 15-20 mm. Vjroad. 



7. Pedicels recurved at maturity; scapes erect 6. U. vulgaris. 



7. Pedicels straight at maturity; scapes flexuous 7. U. floridana. 



8. Spur equalling or longer than lower lip of corolla. 9. 



8. Spur shorter than lower lip of corolla 8. U. gibba. 



9. Spur tapering from base to apex; all leaves bladder- 9. U. biflora. 



bearing. 



9. Spur conic below and linear near tip; some leaves with- 10. U. fibrosa. 

 out bladders. 



1. U. cornuta Michx. — As considered here this species includes 

 Stomoisia cornuta (Michx.) Raf. and S. juncea (Vahl.) Barnh. as cited 

 by Small. The species is primarily of Coastal Plain distribution, 

 although it is knoAvn from other provinces, and its range includes all of 

 our territory. It is ordinarily found in acid places. A local species, 

 U. virgatula Bamh., occurs also in our territory. It may be distin- 

 guished by its very short corolla which is scarcely longer than the calyx. 



2. U. resvpinata B. D. Greene — Shallow water, Florida north to 

 beyond the limits of our territory. Small gives this species as Lecticula 

 resupinata (B. D. Greene) Bamh. 



3. U. purpurea Walt. — Ponds and lakes of varying acidity, its range 

 covering all of our territory. It is listed by Small as Vesiculina pur- 

 purea (Walt.) Raf. Anopheles quadrimaculatus breeding has been found 

 associated with this and other plants of this genus. 



4. JJ. infiaia Walt.^ — Coastal Plain over all of our territory, in ponds 

 with wide range of acidity. There is a smaller variety distinguished 

 by Small as JJ. radiaia Small. 



5. U. foliosa L. — Large flowered species, lower Coastal Plain, 

 Florida westwaid along the Gulf of Mexico to beyond the limits of 

 our territory. 



