246 STUDY OF COMMON PLANTS. 



dried. In this way the seeds are scattered when the 

 weather is most favorable for their being conveyed to 

 some distance. On the whole, the plant with its simple 

 but effective means of protection, persistent subterranean 

 stems, admirable adaptations for cross-fertilization, and 

 numerous seeds with special arrangements for dissemi- 

 nation, is exceedingly well adapted to survive in the 

 struggle for existence. 



RELATIONSHIP. 



I. Compare several of the following plants with the 

 species just studied, directing attention particularly, 

 though not exclusively, to the flowers. (Some of these 

 that bloom earlier than the Linaria, as the wood-betony, 

 may be studied before the latter if more convenient.) 



Wood-betony, Pedicularis Canadensis, L. 

 Painted-cup, Castilleia coccinea, Spreng. 

 Beard-tongue, Pentstemon puhesoens, Solander. 

 Turtle-head, Chelone glabra, L. 

 Monkey-flower, Mimulus ringens, L. 

 Various species of Veronica. 

 Some cultivated species also may be used such as 

 " Kenilworth ivy," Linaria Oymbalaria, Mill. 

 Snapdragon, Antirrhinum majus, L. 

 Foxglove, Digitalis purpurea, L. 



How do these compare as regards 



1. Plan of the flower? 



2. Shape of corolla? 



3. Number of stamens ? 



4. Structure of ovary? 



5. Number and position of seeds ? 



