On the North American Utricularia. 73 



ist in a floating position ; 2d, such to which this position is 

 equally as natural, but which, when the water recedes from 

 them, lose their long, branching, and bladder-bearing roots, 

 and become attached to the earth by shorter and naked ones, 

 that penetrate the surface in the manner usual to other plants ; 

 and 3d, such as are always rooted in the earth. The stems of 

 these last are furnished with a tew remote scales, and if we 

 find these scales attached to the stem of any floating species, 

 we may be certain that it can flourish equally as well in the 

 wet ground as in the water, whilst those with naked stems 

 cannot exist except in water of some depth. 



The generic characters I omit ; they may be found in any 

 botanical work : and proceed to the enumeration of the differ- 

 ent species that have fallen under my observation. 



1. Utricularia ceratophylla. Leaves inflated, 6-verticil- 

 led, floating, furnished on the sides with branching capillary 

 filaments ; flowers large, yellow, subcorymbose ; the upper 

 lip of the corolla rather trilobate, the lower deeply trilobate ; 

 spur short, conoidal flattened (conoideo-complanatum) obtuse, 

 deeply emarginate, appressed to the lower lip of the corolla ; 

 fruit cernuous ; root very long, branching, with numerous 

 capillary radicles furnished with utriculi ; stem eight inches in 

 height. Plate VI. fig. 1. 



A variety is found, in all its parts smaller, the stem scarcely 

 an inch in height. Inhabits from New-York to Mexico. <? 



Of this species there is no doubt ; it has been called inflata, 

 but there being no reason for changing a name already adopt- 

 ed, I have retained that given to it by Michaux. It is the 

 only species in North America, that has real leaves ; the next 

 has something that may be so called, but they differ materially 

 in their form and position from what are found in this, and are 

 really roots. 



2. U. macrorhiza. Leafless, floating; scape about ten 

 inches high, many flowered, furnished with large scales ; flow- 

 ers large, racemed, yellow ; upper lip of the corolla subtrilo- 



