BOTANY 



OF THE 



ROCKY MOUNTAINS. 



SERIES I. 



PHiENOGAMIA or FLOWERING PLANTS. 



Plants bearing true flowers, that is, having stamens and 

 pistils and producing seeds which contain an embryo. 



Class I. ANGIOSPERM^E. 



Pistil consisting of a closed ovary which contains the ovules 

 and forms the fruit. 



Subclass I. DICOTYLEDONS. 



Embryo with a pair of opposite cotyledons. Leaves netted- 

 veined. Flowers usually 4- or 5-merous. 



Division I. POLYPETAL^. 



Perianth consisting usually of both calyx and corolla ; the 

 petals not united with each other, sometimes wanting. 



