296 



TYPICAL FLOWERING PLANTS 



Monocotyledon 

 Corn 

 ' Long, simple, and nar- 

 row. 

 Leaves. < No petiole, but clasp- 

 ing base. 

 Parallel veins. 



Dicotyledon 

 Bean 



Broad, compound. 

 Petiole. 

 Netted veins. 



220. The Bean Flower. — Just before the bean plant reaches 

 full size, greenish buds appear in clusters on the ends of 

 the branches. These green buds grow into the bean 

 flower. This flower is made up of a number of parts, all 

 of which have an important work to do in producing the 

 bean seed. 



The parts of the bean flower have technical names which 

 it is necessary to learn in order thoroughly to understand 



flowers. The green, 

 outermost part, called 

 the calyx (Greek, kalyx, 

 cover), is made up of 

 separate sepals (Latin, 

 separ, separate) which 

 form a cup in which the 

 rest of the flower is 

 fastened. The calyx 

 protects the delicate 

 parts of a flower while 

 they are small. Within 

 the calyx is the white 

 and much larger part 

 called the corolla- (Latin, corolla, crown). The corolla 

 (Figures 305 and 307) is made up of irregular shaped struc- 

 tures called petals (Greek, petalon, leaf) ; within the corolla 

 there is a group of stamens (Latin, sto, stand) which are 

 recognized easily by their slender stalks, filaments, and 

 enlarged tips or anthers. At the exact center of the bean 



Figure 305. — Diagram of Bean Flower. 



