98 Principles of Plant Culture. 



145. The Parts of the Flower Vary in Form in dif- 

 ferent species. In the pea flower (Fig. 46) the five 



petals, shown 

 separately in 

 Fig. 47, are not 

 quite un- 

 the petals 



si 



only 



like 



of the cherry 



flower, but, as 



appears, 



FIG. 46. FIG. 47. 



FIG. 46. Flower of the pea, Pisum sativum. 

 (After Baillon.) 



FIG. 47. The same dissected, showing vari- ri i 



ation in form of the petals. (After Figurier.) are unlike each 



other. The stamens (Fig. 48 st.) and the pistil (Fig. 

 49) of the pea are also quite different in form from 

 those of the cherry. The variety of form in the parts 

 of the flowers of different 

 species is almost infinite. 



146. Certain Parts of the 

 Flower are often Wanting. 

 The flowers of the maple 

 have no corolla; those of the 

 willow have neither calyx nor 

 corolla; certain flowers oi 

 the pumpkin, Indian corn 

 and many other plants have 

 no stamens, while other flow- 



FIG. 48 



FIG. 



FIG. 48. Stamens (st) and 

 pistil of the pea, Pisum sat- 



ers of the same species have ivum. 



FIG. 49. Pistil of the same 

 no pistils (153). In many alone. (After Baillon.) 



varieties of the American plums* the pistil is often 

 wanting. 



147. Composite (com-pos'-ite) Flowersf are made 



*Prunu Americana, P. angustifolia, P. horlulana. 

 t The plants having composite flowers form an extensive family 

 in botany, called Compositae. 



