114 



PLANT GROWTH 



zinnia (Fig. 20, A and B). Inflorescences with branches 

 from the main axis and a loose flower cluster such as the 

 larkspur are called panicles. 



D iJie 



Fig. 21. Petunia. A, general view. B, split to show the relation of the flower 

 parts. C, cross section of the ovary with the ovules. D, longitudinal section of the 

 lower part of the pistil and a side view of the upper part. E, anther with cross sections 

 to show the pollen cavity. A and B, natural size. C, D, and E, 9 x. 



