THE SPRING FLORA 191 



c. Pollination in Iris. Consult the text description and 



confirm the structural arrangements there explained 

 concerning the pollinating mechanism in Iris. 



d. Pollination in jack-in-tlic-pulpit. Be able to explain the 



special devices for pollination in jack-in-the-pulpit. 



3. Summary. Summarize the method and the special mechan- 



isms for securing cross-pollination in Iris and jack-in- 

 the-pulpit. 



4. Seasonal history. Be able to explain and illustrate the 



seasonal history of Iris and jack-in-the-pulpit. 



D. GRAMINEAE 



1. Habitat and habit. Follow the plan outlined above in 



the general directions for studying monocotyledons. 



2. Reproduction. Study the reproductive structures of the 



common cultivated oat (Avena), using the text discus- 

 sion and figures to assist you in understanding the 

 inflorescence, flower, and fruit. Make appropriate draw- 

 ings of inflorescence and flowers. 



3. Seasonal history. Be able to illustrate the seasonal his- 



tory of some common grass and explain the seasonal 

 functions of its main organs. 



4. Economic importance. Summarize the facts relating to the 



economic importance of the plants belonging to the 

 grasses and the grass family (G-ramineae). 



