20 



STRUCTURAL BOTANY 



Now we will consider the parts of a single flower in 

 detail. The first point that strikes us is that, while 

 the stalk (pedicel) is quite bare, all the leaves are 

 crowded together at the end of the branch. The floral 



FIG. 10. Diagrammatic view of the flower of Wallflower 

 (enlarged) in longitudinal section, cut in median plane of 

 outer sepals. 5, sepal ; p, petal ; st l , two of the long 

 stamens ; sfi, one of the two short stamens ; o, ovary ; 

 ov, ovules; siig, stigma. (R. S.) 



leaves are not arranged spirally, but two or more grow 



at the same level. The enlarged end of the stalk, on 



which the floral organs grow, is the receptacle ,or thalamus, 



Beginning at the outside of the flower, we first come 



