MYRTIFLOR&. 



The fruit. What parts of the flower are united in the fruit? Describe the 

 fruit. What is such a fruit called ? How are the seeds freed ? What is the 

 difference between a fruit and a seed in the pea plant ? 



The clover (trifolium). If it is desired to study a clover, study one in a 

 similar way. 



Nitrogen gatherers. The pea, 

 clovers, etc., are often called nitrogen 

 gatherers (see Chapter XV). During 

 an excursion let the pupils dig up dif- 

 ferent leguminous plants, like the pea, 

 clover, lupine, etc. , and search for the 

 "tubercles" on their roots, compar- 

 ing the form of the tubercles on the 

 different kinds of plants. 



Pollination. If the flowers of cy- 

 tisus from a conservatory are at hand 

 attempt to press the point of a pencil 

 in between the parts of the keel in the 

 case of flowers where these parts are 

 still closed ; describe the action of the 

 stamens in throwing the pollen. How 

 could cross-pollination be brought 

 about in such a flower by the visits of 

 insects ? 



Study the common lupine (Lupinus 

 perennis) in the same way. Study the 

 pea flower with the same object in 

 view ; has the pea flower become 

 adapted to self-pollination ? 



Material. Sprays of leaves and 

 flowers ; fruit. Material can usually 

 be obtained fresh early in the spring 

 and for some time later. 



Fig. 233. 



Section of flower 

 of CEnothera. 



Topic VII: Dicotyledons with distinct petals and 

 epigynous flowers. 



ORDER MYRTIFLOR^E. 



(The study of the evening primrose may be omitted. ) 



434. Lesson XV. The evening-primrose family (onogracese). 



In the evening-primrose (oenothera) the flowers are arranged 



