12 



INTRODUCTION 



FIG. 6. 



FIG. 6. Leaf of 

 a willow (Salix sp.). 

 b, blade; />, petiole; 

 s, stipules. 



FIG. 7. Diagram 

 to show the essential 

 parts of a "flower- 

 ing" plant. t.r., 

 tap-root; b .r ., 

 branch root; cot. 

 seed-leaf (cotyle- 

 don)*, i, internode; 

 a.l, leaf-axil; n, node; 

 a.b, axillary bud; r, 

 receptacle of floral 

 organs; ca, calyx; 

 per, perianth; co, 

 corolla; st, stamens 

 (androecium) ; pi, 

 pistil (gynoecium). 



FIG. 7. 



