50. Leaves palmately 
                    sharp-lobed, about as wide or wider than long; sap clear; 
                    fruit dry achenes grouped in spherical heads. 
                     
                     | 
                  Platanus 
                    occidentalis | 
                 
                 
                  50. Leaves pinnately blunt-lobed, 
                    clearly longer than wide; sap milky; fruit a juicy berry. 
                    Some leaves may not be lobed. 
                     
                     | 
                  51 | 
                 
               
             |