PHILOSOPHICAL SOCIETY OF WASHINGTON. 91 



Old World. United States. Total. 



Polypetalous 65 8 73 



Gamopetalous 54 3 57 



Apetalous 28 2 30 



Monocotyledonous 31 1 32 



Coniferae — 1 I 



Total 178 15 193 



It will be seen that the introduced plants amount to 15.5 per cent, 

 of the total flora. 



The several orders to which these belong, are shown in the sum- 

 mary. 



Shrubby Species. 



Of the 342 "Forest Trees" enumerated in Sargent's preliminary 

 catalogue of 1880, this flora embraces 85, or 24.8 per cent., of 

 which 65 are large enough to have the dignity of timber trees. 

 Of these 85, 25 are in the Polypetalous Division, but only 12 of 

 this latter number are large ; 9 are in the Monopetalous Division, 

 all but 2 of which are large; 44 are in the Apetalous Division, 39 

 of which are large; and the remaining 7 are Coniferous, all full- 

 sized trees. 



The whole number of species which are shrubby or woody above 

 ground is 194, which is 15.5 per cent, of the whole; they are dis- 

 tributed as follows : 



Polypetalous 83 



Gamopetalous 36 



Apetalous (Monochlamydeous) 64 



Monocotyledonous (Endogenous) 4 



Gymnospermous (Coniferous) 7 



Total 194 



For further particulars the reader can consult the Summary at 

 the end of the catalogue. 



Comparisons with other Floras. 



While these facts are of great interest in affording a clear con- 

 ception of the character of our flora, they do not aid us in determ- 

 ining in what respects it is peculiar or marks a departure from 



