132 THE LATER EXTINCT FLORAS OF NORTH AMERICA. 



DICOTYLEDONEiE OF UNCERTAIN AFFINITIES. 



Protophyllum minus Lesq. 



PL IX, fig. 3. 



Cret. Fl. (1874), p. 104, PI. XIX, fig. 2 ; XXVII, fig. 1. 



Note. — So identified by Dr. Newberry, as indicated by memorandum on 

 margin of plate. — A. H. 



Formation and locality: Cretaceous (Dakota group). Fort Harker, 

 Kansas. 



Protophyllum multinerve Lesq. 



PI. VII, fig. 4. 



Cret. Fl. (1874), p. 105, PI. XVIII, fig. 1. 



Pterospermites multinervis Lesq. Hayden's Ann. Rept. 1871 [1872], p. 302. 



The figure now given shows the basal portion of a leaf which may 

 have been 6 inches in diameter. It is intended to exhibit its peculiar 

 sub-peltate character by which it may be at once recognized. More or 

 less complete leaves of this species are quite common in the Cretaceous 

 rocks of Kansas, and a large number are in my possession. None of these 

 are absolutely perfect, but some are so nearly so as to permit me to add 

 something to the ' description given by Lesquereux. 



The leaf when in normal form was nearly orbicular, being slightly 

 pointed above, uniformly rounded at the base, and evidently somewhat 

 cupped by the interior insertion of the petiole. The margin was entire 

 or slightly undulate, the nerves strong, regular, approximately parallel, 

 camptodrome, the branches terminating in the prominences of the margin 

 where it is undulate. 



The resemblance of these leaves to those obtained from the Tertiary 

 of Greenland and described by Heer under the name of Pterospermites (P. 

 dentatus, P. integrifolius, P. spectabilis, and P. alternans) is very striking and 

 gives presumptive evidence of botanical affinity. 



The large leaves brought by Dr. W. H. Dall from Alaska and figured 

 on Pis. LIII and LIV evidently belong in the same category and may 

 not be specifically different from Heer's P. spectabilis. No satisfactory 

 conclusion, however, can be reached in regard to the relations of this 

 group of leaves until the fruits belonging to the same tree shall be found. 



