102 A LABORATORY MANUAL OF BOTANY 
LESSON LXVI 
Rose allies—Wild rose (Rosa), raspberry or blackberry 
(Rubus), and wild strawberry (Fragaria) as types. 
LESSON LXVII 
Pea and bean allies—Honey locust (Gleditschia), bean 
(Phaseolus), pea (Pisum), broom (Cytisus), and clover (T'ri- 
folium) as types. 
LESSON LXVIIT 
Mint allies——Mint (Mentha) as a type. 
LESSON LXIX 
Composites—Sunflower (Helianthus), black-eyed Susan 
(Rudbeckia hirta), bur-marigold (Bidens), and ox-eye daisy 
(Chrysanthemum) as types. 
Note especially that the flowers are gathered into dense 
heads; that the outside ones have their corollas greatly en- 
larged into strap-like ray-flowers, while those in the center 
of the head are reduced into inconspicuous disk flowers. 
Are all floral organs present in both ray and disk flowers? 
Draw the parts of both kinds of flowers and make their 
floral diagrams. 
In what respects are composite flowers an advance over 
other flowers studied? 
Is cross-pollination more easily secured in this type of 
flower? Discover some methods for preventing close-pdl- 
lination. Is this to be regarded as a successful family? 
