FLORA. 



SERIES I. 



PH>ENOGAMIA or FLOWERING PLAf .3. 



Plants having true flowers, with stamens and pistils, and 

 producing genuine seeds which contain an embryo. 



Class I. EXOGEXJE. 



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

 a layer between the other two, and increasing, wlien the 

 stem continues more than one year, by the addition each 

 year of a layer next to the bark ; the bark also growing, from 

 year to year, by a layer on its inner surface. Leaves generally 

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

 or several in a whorl. Parts of the flowers usually in fours 

 or fives. 



Subclass L AIS'GIOSPERM^. DICOTrLEDON^OUS 

 PLAKTS. 



Pistil consisting of a closed ovary, which contains the 

 ovules, and forms the fruit. Cotyledons only two. 



DIVISION I. THALAMiFLOR/E. 



Floral envelopes generally double, i. e., consisting of both 

 calyx and corolla. Petals and stamens generally separate, 

 implanted on the receptacle, under the ovary, free from it, 

 and from the calyx. A few genera and species of this 

 division are destitute of petals. 



