Suggestions for Laboratory Work to Precede Chapter 

 Twenty-three 



1. A lily, tulip, or wild onion may be used in studying the 

 flowers of the monocotyledons. Attention should also be given 

 to the leaf and stem characters of this group. Narcissus bulbs 

 grown in water will furnish excellent material. 



2. Any convenient dicotyledon may be used to show the type 

 of flower and the associated leaf and stem characteristics. Ge- 

 raniums, oxalis, and impatiens may be obtained at all seasons of 

 the year. In autumn and spring many plants are available. 



3. A collection of the more important grain plants, fibers, and 

 fiber plants is easily made. These will be helpful in studying the 

 economic uses of plants. 



4. The examination of pressed specimens representing the more 

 important families of angiosperms will be an aid in learning family 

 characteristics. Fresh specimens are always to be preferred, if 

 they can be obtained. 



302 



