THE FLOWEEING PLASTT FLOWERS 373 



petals with regard to the calyx lobes ? In what 

 respects do the petals resemble leaves ? What 

 position have the petals in unopened buds? 

 What is the use of the corolla? 



Draw the entire corolla and several of the 

 petals, 

 (c) The andrcecium, consisting of the stamens. 

 — What is its position in the flower ? Does it 

 bear any resemblance to the calyx and corolla ? 

 Does every blossom contain an andrcecium? 

 How many stamens in the andrcecium ? How 

 are they arranged with regard to the calyx and 

 corolla and with regard to one another ? Are 

 they all of the same shape ? Size ? Color ? 

 Make a diagram of the andrcecium, showing the 

 arrangement of its parts. 



Examine a single stamen and make out the 

 'following parts : 



(1) The filament or stalk. — What is its shape ? 

 Length? Do you find variations in length? 

 Can you give reasons for the same ? What is 

 its diameter ? Color ? Does it bear any out- 

 growths, such as hairs ? If so, where are 

 they ? Why here ? 



(2) The anther. — What is its position on the 

 filament? Shape? Size? Color? To what 

 is the color due? Make out the two parts, 

 pollen-sacs, of the anther joined by the con- 

 nective, also the lines of dehiscence along 

 which the sacs split open. Can you trace 

 any resemblances between the anther of a 

 flower and the sporangium of a fern ? Draw 

 a stamen. Note the fine powder or pollen 

 which comes out of the sacs. Put some of 



