36 FLORA OF WASHINGTON AND VICINITY. 



to other parts of the United States.* These are distributed through 

 the several larger groups as follows : 



Groups. 



Old 

 World. 



United 

 States. 



Total. 



"Polypetalous 



Gamopetalous 



Apetalous (Monochlamydeous) . . . 

 Monocotyledonous (Endogenous) 

 ■Gymnospermous (Coniferous) 



Total . 



178 



15 



193 



It will be seen that the introduced plants amount to 15.5 j)er cent, of 



the total flora. The several orders to which these belong are shown in 



the Summary. 



Shrubby Species. 



Of the 342 " forest trees " enumerated in Sargent's preliminary cata- 

 logue 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 remain- 

 ing 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 distrib- 

 uted as follows : 



Polypetalons 83 



Oamopetalous 36 



Apetalous (Mouoclilamydeous) 64 



Monocotyledonous (Eudogeuous) 4 



vGymnospermous (Coniferous) 7 



Total..: 194 



'For further i)articulars the reader can consult the Summary at the 

 »end of the catalogue. 



Gomimrisons with other Floras. 



While these facts are of great interest in afibrding a clear conception 

 of the character of our flora, they do not aid us in determining in what 

 respects it is peculiar or marks a departure from those of other portions 



* These are the following : 



XanthoxyluniAmericanum. Ribes rotundifolium. Catalpa bignonioides. 



Trifoliuni repens. Ribes rubrum. Maclura aurantiaca. 



Prunus Chicasa. Passiflora incarnata. Populus grandidentata. 



Rosa setigera. Symphoricarpusracemosus. Poa annua. 



Philadelphus inodorus. Symi>horicarpu8 vulgaris. Pinus Strobus. 



