Studies of Selected Spermatophytes. 233 



ternately compound? Describe the leaflets. What term 

 would you apply to the inflorescence? (See page 158.) 

 Examine a bud. What sort of a calyx has it ? Note what 

 becomes of the calyx about the time when the flower 

 opens. Examine the interior of the spurs of the subcor- 

 date outer petals. Do they contain nectar ? Is the nectar 

 apparently secreted by the spur itself, or are there out- 

 growths from the stamens (as in the violet), which serve as 

 nectaries ? Are the flowers fragrant ? Notice how the 

 two inner petals, united at their apices, protect the anthers 

 and stigmas. Would these petals be pushed aside by bees 

 in quest of nectar? Do they spring back after being 

 pushed aside ? Note the actions of bees in visiting these 

 flowers. Do the anthers dehisce while the flowers are 

 still in bud ? As soon as the pollen is discharged, are the 

 stigmas ready to receive it ? Could self pollination possi- 

 bly take place ? Would it make any difference in the 

 problem of pollination whether insects work from the bot- 

 tom of the inflorescence upward or vice versa ? Dissect a 

 flower and draw the different parts. Make longitudinal 

 and cross diagrams of a flower. 



Corydalis. (Obtainable species.) 



Study according to the outline for Dicentra. Compare 

 Dicentra and Corydalis. Why should they not be classified 

 under the same genus ? 



Capsella bursa-pastoris. 



Draw an entire plant, using the symbols for leaves, 

 flowers, and fruits suggested on page 158. Draw a typical 

 basal leaf and stem leaf. Draw a single flower showing a 

 combined side and top view. Dissect a flower and draw 

 one of each set of parts. Find the term tetrad ynamous in 

 the glossary. Can it be applied to this flower ? Draw a 



