MYRTIFLORjE. 



271 



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 (irifolium, . — 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 ,,, ... 



. , Mw Flg - 2 » 



and for some time later. Ugf Section of flower 



f (Knothera. 



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 (onograceae). 

 — In the evening-primrose (Oenothera) the flowers are arranged 



