THE FLORA: 



^ELECTIONS FROM THfc NATIVE AND CULTIVATED PLANTS 

 OP THE UNITED STATES. 



Designed as first exercises in Analytical Botany. 



KXPLANATIONS. The Tables in this work are designed to be complete, that is, each Ordinal 

 Table includes all the genera belonging to that order known within the limits of the Flora (i. .. the 

 States east of the Rocky Mountains); and each Generic Table includes, in like manner, nil its 

 known species. The numbers annexed to the genera in the Ordinal Tables, refer to the descrip- 

 tions immediately following. If no number be annexed, the pupil will understand that that genus 

 Is not further noticed. 



COHORT I. 



THE POLYPETALOUS EXOGENS. 



Essential Character. Flowering Plants 

 with their stems growing by additions to their outside in 

 layers (EXOGENS), their seeds inclosed in a seed-vessel or peri- 

 carp (ANGIOSPERMS), their flowers with a double perianth and 

 their petals distinct (POLYPETAL^E). (But to this last condition 

 there are many exceptions.) 



ORDER I. RANUNCULACEJE. The Crowfoots 



Herbs, rarely shrubs, with a colorless, acrid jnice, with 



leaves mostly alternate and much divided, without stipules ; 



tepals 3-15, deciduous, distinct, and colored when apetalous; 



veiah 3-15, distinct, often deformed or contracted or wanting; 



itawens oc, distinct, hypogynous ; 



pistils oo (rarely 1 or few), distinct, becoming in 



fruit either achenia, follicles, or berries. 



