BOTANY 



NORTHERN UNITED STATES. 



SERIES I. 



PH^NOGAMOUS or FLOWERING PLANTS. 

 Vegetables bearing proper flowers, that is, having sta- 

 mens and pistils, and producing seeds, which contain an 

 embryo. 



Class I. DICOTYLEDONOUS or EXOGE- 

 NOUS PLANTS. 



Stems formed of bark, wood, and pith ; the wood form- 

 ing a layer between the other two, increasing, when the 

 stem continues from year to year, by the annual addition 

 of a new layer to the outside, next the bark. Leaves net- 

 ted-veined. Embryo with a pair of opposite cotyledons, 

 or rarely several in a whorl. Flowers having their parts 

 usually in fives or fours. 



Subclass L ANGIOSPliiRM^. 



Pistil consistuig of a closed ovary, which contains the ovules and 

 forms the fruit. Cotyledons only two. 



