BOTANY 



NORTHERN UNITED STATES. 



SERIES I 



PII^NOGAJVIPUS OR FLOWERING PLANTS. 



Vegetables bearing i)ro{)cr flowers, that is, liaving sta- 

 mens and pistils, and producing seeds, -wlucli contain an 

 embryo. 



Class L DICOTYLEDONOUS or EXOGE- 

 NOUS PLANTS. 



Stems formed of bark, wood, and pith ; the wood forming 

 a layer between the otiier two, increasing, when the stem 

 continues from year to year, by the annual addition of a 

 n^w layer to the outside, next the bark. Leaves netted- 

 vcined. Embryo with a pair of opposite cotyledons, or 

 rarely several in a whorl. Flowers having their parts 

 usually in fives or fours. 



Subclass I. AXGIOSPERM^. 



Pistil consisting of a clo-ctl ovary, whidi contains the ovules tind 

 forms the fruit. Cotyledons only two. 

 3 



