88 



PRINCIPLES OF PLANT CULTURE 



FIG. 44. Fruit spur of 

 the pear. Reduced one- 

 half. 



leaf-like parts, each of which is called a sepal. In the 

 cherry blossom, the sepals are united nearly to the top. 

 The calyx is usually green, but in the tulip and some 

 other flowers it is of another color. 

 In the apple and pear, the calyx 

 becomes a part of the fruit, and 

 its points are visible in the depres- 

 sion opposite the stem. 



142. The corolla. The more 

 spreading part of the cherry blos- 

 som, which is normally white (Cor., 

 Fig. 45) constitutes the corolla. 

 In the cherry, the corolla consists 

 of five distinct parts, only three of 

 which appear in the figure, called 

 petals. In many plants, as the pumpkin and morning 

 glory, the petals are united. In other plants they 

 are united a part of the way to the top. The corolla 

 is usually of some 

 other color than ^ 



green. 



143. The sta- 

 mens. Inside 

 the corolla is a 

 group of slender 

 organs (SS, Fig. 

 45), called sta- 

 mens. Each sta- 

 men consists of 

 three parts, viz., the long and slender portion, connected 

 with the calyx below, called the filament; the swollen 

 part at the top, called the anther ; and the yellow dust 

 found upon or within the anther, called the pollen. 



FIG. 45. Section of cherry blossom. 

 Cor. corolla ; S stamens. 



C calyx ; 



