.0 DIANDRIA. MONOGYNIA. utriculariav 



lies; lewci lip of the corolla 3-lobcd ; spur deeply emar^i- 

 nate. IV a 1 1. Car. p. 54. Elliott Sk. I. p. 20. U. ce- 

 ratophylla Mich. Fl. I. p. 12. Pursh Fl. 1. p. 15, 

 I'ah'l Ennm. I. p. 197. Roem. c^ SchulU I. p. 194. 

 .Y 2< 1 1. Gen. 1. c. 



Root perennial. Leaves (roots ?) submerged, dichotomously 

 branching, furnished at the divisions with numerous com- 

 pressed air-vessels or utricuU ;* radical leaves (involucrum) 

 alternate, but so close as to appear verticillate, cylindrical, of 

 a delicate spongy texture, dichotomously divided at the extre- 

 mities into many capillary segments furnished with utriculi. 

 Scafie about 8 inches long, 5 — 8-flowered; lower fieduncles 

 elongated, so as to give the flowers a corymbose appearance. 

 Bracts ovate, obtuse. Calyx persistent; leaves ovate, con- 

 cave. Corolla about 3-fourths of an inch in diameter, yellow ; 

 ufificrli/i broad-ovate, entire; lower lifi 3-lobed, crenate; sfiur 

 half the length of the lower lip, conic-lanceolate, compressed^ 

 bifid ; tube of the corolla very short. Filameyits inserted near 

 each other at the base of the lower lip. Style as long as the 

 stamens. 

 Hab. In ponds on Long-Island : particularly abundant near 

 Babylon. In the lower part of Delaware, near Lewiston^ 

 .Yuttall. Neav Elizabeth-Town, New-Jersey. Eddy, 

 August. 



2, \].xulgarts L.: floating; stems submerged, dichoto- 

 iTious ; leaves many-parted, vesiculose ; scape 5 — 9-flowered: 

 upper lip of the corolla entire, broad-ovate ; spur conical, in- 

 curved. Wi 1 1 d. Spec. I. p, 198. Vahl Enum. I. p. 1 98. 

 Eng.Bot. t. 253. Big. Bost. p. 6. Pursh Fl. I, p. 16. 

 Roem. (^ Schult. 1. p, 195. U . macrorhiza Le Conte. 

 monog. Utric. ined. Cat. pi, N. York, p. 11. 



Perennial. Stems submerged, 1 — 3 feet long. Leaves some- 

 what pinnate, dichotomous, capillary. Scape 8 or 9 inches 

 long, generally bearing 7 or 8 flowers. Peduncles about 

 3-fourths of an inch long, bractcated at the base, spreading, and 

 at length reflected. Calyx persistent ; leaves concave, with- 

 out nerves ; the lower one a little emarginate. Corolla yelloW; 

 as are all the succeeding, except No. 8 ; lower lip entire, cre- 

 nulate on the margin, striated with red ; palate equal ; spur 

 rather obtuse, and entire at the apex. Style as long as the sta- 

 mens ; stigma 2-lipped, the upper lip truncate, the lower 

 fringed. 

 Hab. In ponds of deep water, and sometimes in slow-fibwing 

 streams. Common throughout the Northern States. August. 

 Allied to U. fibrosa Wa 1 1. but distinct. 



* \t first, these vesicles are filled with water ; when the flowers are 

 ready to expand, they become inflated with air, to raise the scaj^e above 

 v.-ater. After flowering-, the air escapes and the plant sinks. 



