ANBROPOGON SORGHUM 



195 



shedding anthers may be in contact at time of opening, and 

 since the stigma is receptive at this time, some self-poHination 

 must take place. Pollination between flowers of the same 



Fig. 72. — Four stages in the opening of the spikelet of sorghum (Andropogon 

 sorghum). X 5- 



plant is very common. The upper flowers are shedding pol- 

 len in abundance, as the receptive stigmas of lower flowers are 

 opening. And, in the light breeze of the morning, the head is 



