500 



Hill : Celtis pumila Pursh 



Celtis occidentalis. Fig. i 



Nutlet pale to dark fuscous, higher than wide, 6—8 x 5~^ 

 mm., slightly obovate, apiculate, unsymmetrical. Surface more 

 regularly reticulated, the pits deeper, the walls a little sharper than 

 in C. pumila. 



Fig. i. 



Fig. 2 



Fig. 3 



Fig. 4. 



Celtis reticulata. Fig. 2 



Nutlet grayish -white, globose, 6 x 5.5 mm., unsymmetrical. 

 Surface irregularly and coarsely reticulated, pits rather deep, larger 

 ones raised in the center, bordering walls broad. 



