PRACTICAL WORK. NO. XI. 219 



vii. Sketch an old prothallus of a fern, shewing on 

 your sketch 



a. the prothallus ; 



6. the young sporophyte growing from its lower surface. 



No. XI. 



THE FLOWER. 



i. Examine a flower of Ranunculus, noting : 

 a. calyx of five sepals ; 

 6. corolla of five petals ; 



c. andrcBcium of numerous stamens ; 



d. gynoecium of numerous free carpels. 



Cut the flower in half longitudinally and make a 

 sketch of the section shewing the relative position of the 

 parts. 



Sketch a single stamen shewing the lines of dehiscence 

 of the anther ; 



ii. Sketch the papilionaceous flower of the Bean, 

 shewing the calyx and corolla. 



Dissect the flower and make sketches of: 



a. calyx of five sepals joined together ; 



6. the petals of the corolla, viz. : 



1. the standard or vexillum, 



2. one of the two wings or alae, 



3. two petals joined together to form the keel or 

 carina which covers the essential organs. 



c. androecium, consisting of ten stamens, of which nine 

 are joined together by their filaments, forming a trough 

 enclosing the ovary; the tenth stamen roofs in the trough. 



