12 THE PALEONTOLOGY OF MINNESOTA. 



LPopulites. 



POPULITES LITIGU08US Hftff. 

 PLATE A, PIG. 3. 



Populus Utigiosa Heer, Phyll. du Neb., 7, p. 13, PI. 1, f. 2. NewVy, Notes on Extinct Floras, p S. 

 lllustr. PI. IH, f. 6 ; PI. IV, f, 1. 



Leaves round, very entire at base; lateral nerves opposite in the lower pairs, alternate 

 in the upper, all distant; nervilles strong, curved, not dividing, the upper forking ; marginal 

 nerve none or thin and short. 



Comparing the specimens from Minnesota with the figure in the "Phyll.'' I. c. the 

 identity is easily ascertained, though the figure of Heer represents a mere fragment. 

 The author does not mention in the description the presence of a marginal or basilar 

 nerve which in some leaves, as in the one from Minnesota, is quite strong, while in 

 others it is thin and sometimes even indistinct. 



Hab. North side of the Big Cottonwood river, near New Ulm. 

 Mus. Beg. No. 5155. 



POPULITES LANCASTRIENSIS Lesqx. 



PLATE A, FIG 4. 



Orel. Fl. p. 58, PL III, f. 1. 



Leaves large, broadly cordate ovate, obtusely pointed; borders entire, slightly undulate; 

 basilar nerves in five, the upper alternate or sub-opposite, somewhat flexuous, branching from 

 above the middle, all sub-camptodrome; nervilles very thin, the lower undivided, the upper 

 broken and branching. 



The leaf is well preserved; the apex and the petiole, however, are destroyed; 

 it is smaller than that in Cret. Fl. /. c., and more like that of Newb'y, lllustr., 

 PI. 3, f. 7. named Populus cordifolia, but appears to be referable to the same species, 

 though the basilar nerves are in three. 



Hab. North side of the Big Cottonwood river, near New Ulm, Minnesota. 

 Mus. Beg. No. 5155 D. 



POPULITES WINCHELLI, SJD. nov. 



PLATE B, FIG. 2. 



Leaf coriaceous, rhomboid-elliptical, borders regularly undulate-repand; nervation 

 palmate-pinnatifid, obscurely craspedrome; medial nerve somewhat thick; basilar lateral 

 nerves emerging a little above the top of the petiole, sparingly branching; secondaries thin, 

 alternate, distant, parallel, simple. 



A fine leaf, 7 cm. long without the petiole, which is broken 1 cm. below the base 

 of the leaf, 5 cm. broad in the middle. Its form is the same as that of P. repando- 



