THE SPRING FLORA 183 



4. Fruit and seed. To what class of fruits does that of the 



yarrow belong ? Is there any definite device for seed 

 and fruit dispersal ? 



5. Summary. Summarize the distinctive features of the 



yarrow, as a representative of the Oompositae, under 

 the above headings ; namely, inflorescence, flowers, polli- 

 nation, and fruit. Give the distinctive features only. 



6. Analysis. Ascertain the scientific name of the yarrow by 



means of a manual. 



DAXDELIOX (TARAXACUM) 



1. Habit and adjustments by tropisms. 



a. Study the plants of the dandelion in flower and deter- 

 mine the relations of its organs to each other and to 

 the environment. Consult the text discussion (Part I) 

 concerning the adjustments of the leaves, flowers, 

 and fruits for photosynthesis, food absorption, polli- 

 nation, and seed dispersal. Confirm these points by 

 field observations. 



2. Reproduction. 



a. Vegetative reproduction. 



(1) Dig up a number of plants of the dandelion. Is the 



stem simple or branched ? Do you discover how 

 a single plant may give rise to a group of offspring 

 by vegetative reproduction ? 



(2) Construct outline figures to illustrate what you find 



in this respect. 



b. Inflorescence and flowers. 



(1) Compare the general structural parts of the inflores- 

 cence and flower of the dandelion with that of 

 the yarrow. In what respects are they similar ? 

 In what respects do they differ ? 



