TWENTY-FIRST ANNUAL MEETING. 



41 



II 



a. 



7w 



Fig. II. 



II. a. Hyosotis. Flower with closed corolla. 



b. Stamen. Onion, an, anther ; vol, pollen; fil, filament 



c. Stamen. Lime. 



d. Stamen Colchicum. 



e. Diagrammatic section of a flower of the Foxglove. C, calyx; cor 

 corolla; s, stamen; p, pistil. 



The dotted lines show where the various parts are united to each other. 



Ill 



Fig. III. 



a-f. Pollen grains, a, lily ; b, cherry; c, evening primrose ; d, pine; e, 

 polygola; /, hollyhock. All greatly enlarged. 

 g. Pollinia of Milkweed, the pollen being united in wax-like masses. 

 h. Section of a pistil showing fertilization of the ovules, pol. pollen; 

 tu, pollen tubes; ov, ovules; pc, placenta. 



