158 



Introduction to Botany. 



any direct bearing on pollination, and whether in the open 

 flower the relation of calyx or corolla to the stamens and 



pistil has anything to do 

 with pollination. 



F. If there are irregu- 

 larities of structure try 

 to find their significance. 

 126. Having become 

 familiar with the method 

 of working with flowers, 

 study the plant as a 

 whole, and make dia- 

 grams to show the habit 

 of plants, and the man- 

 ner in which the flowers 

 are borne. 



In showing the habit 

 of the plant and the 

 character of the inflo- 

 rescence, conventional 

 forms may be used. 

 Thus / of Fig. 82 may 

 stand for a leaf, o for a 



spike s, head of the clover type t, head of the n i j t r 



composite type «, a compound cyme, v; floWCr bud,/ for an Open 



either cluster to the right and left of the cen- flower and O for a fruit. 

 tral flower would represent a simple cyme. t t • . i 1 i 



Usmg these symbols, 

 the chief types of inflorescences may be represented as in 

 diagrams r toy in Figs. 82 and 83. r represents a raceme, 

 in which the axis of the inflorescence elongates with age, 

 giving rise to new flowers as growth in length proceeds, 

 each flower having its own stalk or pedicel, s represents 

 a spike or ament, which differs from a raceme in having 

 the flowers sessile upon the common axis, jt is a diagram 



Fig. 82. 



Conventional diagrams to represent a leaf /, 

 flower bud o, open flower/, fruit q, raceme > 



