FLORA 



SOUTHERN UNITED STATES. 



SERIES I. 



PLLEXOGAMOUS or FLOWERING PLANTS. 



Vegetables furnished with flowers, consisting of stamens 

 and pistils, and usually floral envelopes of some kind, aud 

 producing seeds which coutaiu an embryo. 



Class I. DICOTYLEDONOUS or EXOGENOUS PLANTS. 



Stem composed of bark and pith, which are separated by 

 an interposed layer of woody fibre and vessels, and increas- 

 ing in diameter, in all perennial stems, by the annual depo- 

 sition of new layers between the wood and bark. Leaves 

 reticulate-veined, commonly articulated with the stem. 

 Floral envelopes usually in fours or fives. Cotyledons 

 two, rarely more. 



Subclass 1. AXGIOSPERAL&. 



Ovules enclosed in an ovary, and fertilized by the action 

 of the pollen, through the medium of a stigma. Cotyledons 

 two. 



Division I. POLYFETALOUS EXOGENOUS PLANTS. 



Floral envelopes double, consisting of both calyx and 

 corolla ; the latter of separate petals. 



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