dite flowers, others only stamens, as in buckeye. 



DiCHOGAMOUS. Stamens and pistils mature at different 

 times. 



Proterandrous : Stamens mature before pistil, as in 

 sunflower.- 



Proterogynous : Pistil matures before stamens, as in 

 Plantain. 



Heterodichogamous : Occurence of two kinds of plants 

 of the same species — some proterandrous, others protero- 

 gynous. 



FIG. 2. 

 Pig:, 2. Flowers of Vallisneria spiralis on the surface of the water, The float- 

 ing staminate flowers; one has come in coDtact with the stigmas. (After Ear- 

 ner von Marilaun] . 



DiPTOPOGAMous. Stamens and pistils in the same plant 

 but at different heights. Stamens on other individuals corr 

 responding in heights to pistils and vice versa: 



Heterodistylous : Occurence of two kinds of plants,| 

 some plants having long stamens and a short style and 

 others having short stamens and a long style, as in primrose. 



