45^ BOTANICAL GAZETTE [December 



Doubtful : 5". parvifolium, S. cretaceum heterolobum^ S, sp. 

 Lesq. (from Montana) , 5. sp. Dawson (from Canada), 5. sp. 

 Knowlton (from Kansas), S. sp. Lesq. (from New Jersey), S. 

 Sekvy?iit, S. Bicrpeana^ S. Leconteanum, 5. prunordiale, and S. 

 hastatmn. 



Passaic, N. J. 



Explanation of Plate XVIII. — One-half contours of leaves of Sas- 

 safras Sassafras, showing variety of lobation ; reduced three-fourths. 



t 



