DIANDRIA MONOGYNIA 7 



1. U. MAcnoiuiizA, Le Conte. Leafless; floating ; root long, .some- 

 what repent, dichotomously branching, vesiculose ; scape many-flower- 

 ed. JjC Conte, Jinn. Lye* JV. Y. 1. p. 73. 



U. vulgaris. Pursh, Am. I. p. 15. Muhl* CataL p. 3. Bart. Phil. 1. 



p. 10. Bigel Boat. p. 7. Torr. FL 1. p. 18. Florid. Cestr. p. 3. Ton. 



Comp.p.%0. Beck, Bot. p. 287. Not of Z. fftfta. Per*. .Ait, nor 



Until. 



Large-rooted Utriculaiua. Vulgb — Bladderwort, Hooded Milfoil. 



Perennial. Growing in the water. Root (or radical appendages,) submersed, 

 slightly attached to the mud at bottom, long, branching, decompound, resembling 

 finely dissected aquatic leaves ; segments, or radicles, capillaceous, flat, setaceous- 

 ly toothed on the margin,— the first ones naked, the rest furnished with vesicles,- 

 the terminal ones (when first developed or growing ?) densely clustered together, 

 broader, and fringed with little fascicles of bristle-like cilue. Scape assurgent, 

 5 to 10 inches long. Floxcers, 4 to 6 or S, in a raceme : peduncles about three-fourths 

 of an inch long, with each a membranaceous bract at base. Corolla yellow, with 

 brown stripes on the palate. 



Hah. Stagnant pools : Brandywine : not common. Fl. Juno. Fr. 



Obs. Mr. Le Conte considers th >se multifid appendages at the base of the scape, 

 which have heretofore been called leaves, as genuine roots ; and avers, moreover, 

 that our plant is decidedly distinct from the U. vulgaris of Europe,— with which 

 it was long confounded. There are 9 or 10 additional species in the U. Slates ; t ui 

 this is the only one which has yet been found in Chester County. 



13. Ovary inferior'. Corolla dipetalous. 



7. CIRCJEA. L. JSTutt. Gen. 27. 

 [Poetically named after the fabled Enchantress, Circe."} 



Calyx 2-parted. Petals 2, obcordate. Stamens alternating with the 

 petals. Capsule obovate, hispid with uncinate hairs 2-celled, not 

 opening; cells each 1 -seeded. 



Herbaceous: leaves opposite ; flowers in terminal and lateral racemes ; fruit un- 

 cinately fyispid. Aut. Ord. 49. Lindl. Circjbaceje. 



1. C. Lutetiawa, var. canadensis y L. Stem erect, glabrous; leaves pe- 



tiolate, ovate, acute, remotely toothed, nearly smooth. Beck, Bot. p. 



120. 



C. Lutetiana. Pers. Sun. 1. p. 10. Bigel. Boot. p. 11. 



C. canadensis. Muhl. CataL p. 2. Florul. Cestr. p. 5. 



Parisian Circjba. Vulgd — Enchanter's Night-shade. 



Root perennial. Stem simple, 12 to IS inches high. Leaves often cordate ai 

 base, acuminate, remotely and somewhat repand-denticulate, finely ciliate. Flow- 

 ers in virgate racemes, alternate and pedicellate. Calyx superior ; lobes contract- 

 ed into a little tube at base. Corolla reddish while ; petals alternate with the lobes 

 of the calyx. Style longer than the stamens ; stigma emarginate. Pedicels of ike 

 fruit reflexed. 



Bab. Moist, rich woodlands : common. Fl. July. Fr. August. 



Obs. Our plant varies somewhat from the C. Lutetiana, of Europe. There is 

 ene other species found in the United Slates. 



