GLOSSARY OF BOTANICAL TERMS 175 



situated in separate flowers either on the same 

 plant or on different plants (see definition 91). 



In some the anthers mature and shed their 

 pollen before the stigma has matured to re- 

 ceive it. Such flowers are said to be proter- 

 androus. (92) 



In other plants (but this is less frequent) 

 the stigma ripens first, is fertilized by pollen 

 from other flowers, and dies down before the 

 anthers come to maturity. Such flowers are 

 said to be proterogynous. (93) 



In some flowers the anthers open on the side 

 farthest away from pistil. (94) 



Some species have two distinct kinds of 

 flowers always borne on separate plants. (95, 

 A and B) 



In 95 A the stamens are half-way down the 

 corolla tube, but the style is long and the stigma 

 peeps out at the top. 



In 95 B the positions of stamens and pistil 

 are reversed. 



Neither plant is self-fertilizing. Every 

 long-styled flower must be f ertilized by pollen 

 from a short-styled flower and vice versa. In 

 95 A no pollen can fall upon the stigma from 



