72 PLANTS 



172. The grasses, sedges, lilies, palms and orchids are the 

 most important groups of the Monocotyledons. The Dicoty- 

 ledons include most of the remaining seed-bearing plants except 

 the "evergreens." 



FIG. 35. Inflorescences of the pine, i, Terminal twig; 2, ovulate cone; 3, 

 staminate cone; 4, two-year-old cone. 



Gymnosperms 



173. The Gymnosperms are distinguished from the Angio- 

 sperms by the fact that the ovules are not enclosed by the walls 

 of an ovary, but are simply covered by a scale. To this group 

 belong the cone-bearing "evergreens;" as e. g., the pine, cedar, 

 yew, larch, and spruce. 



Cryptogams 



174. Not all plants produce seed. There is a great variety 

 of organisms which are not included in the groups so far consid- 



