BOTANY OF THE UNITED STATES, 



NORTH OF VIRGINIA. 



/X/\>^/Nx\^vxvyxx\yNX\/\^\x\x-* 



DIVISION I. 

 FLOWERING OB PHENOGAMOUS PLANTS, 



PLANTS FURNISHED WITH FLOWERS AND PRODUCING SEEDS. 



CLASS I. EXOGENOUS OR DICOTYLEDONOUS 

 PLANTS. 



Stem composed of bark, wood and pith ; increasing by an 

 annual deposit of new wood and cortical matter between the 

 wood and bark. Leaves articulated with the stem, their veins 

 reticulated. Propagation effected by stamens and pistils. 

 Ovules in a pericarp ; embryo with two or more opposite 

 cotyledons. 



SUB-CLASS I. THALAMIFLORALS. 

 Calyx many sepalled. Petals many, distinct, and with the 

 stamens inserted into the receptacle. 



ORDER I. RANUNC UL ACE M. CROWFOOTS. 



Calyx of 3 6, (but usually 5,) distinct deciduous sepals. 

 Petals 3 15 (sometimes wanting.) Stamens indefinite in num- 

 ber, distinct. Pistils numerous. Fruit either dry nuts or 

 carpels, baccate, or follicular. Seeds solitary or Several. Her- 

 baceous plants or rarely shrubs. Leaves alternate or opposite, 

 generally much divided, with the petiole dilated at the base. 

 Flowers usually conspicuous. 



