SOLANACEyE 



563 



becomes spreading later. "It is smooth and generally solid. 

 It has no ribs at lust, but as it develops, it becomes more or 

 less quadrangular. 



Leaves. — Potato leaves are compound jiinnate, with more 



,U."Fl'>w 



luim luhorosuni) 



or less petioled leallets. The petiole bears a number of 

 supplemenLar>- leallets which vary in number and importance 

 with the age of the i)laiU. 'i'he rachis is decurrent (Fig. 12) 

 on the stem. The leallets are oval, acuminate, and the base 

 heart-shape or oblique in shape. The leaves as well as the 

 stems are characterized by a narcotic smell. At the begin- 



