90 BULLETIN OF THE 



Large Genera. 



The fifteen large genera arranged according to the number of 

 plants are the following : 



Species and varieties. 



1. Carex 70 



2. Aster , 21 



3. Panicum 19 



4. Solidago 18 



5. Quercus 18 



6. Polygonum 16 



7. Dcsmodium 14 



8. Salix 14 



9. Juncus 14 



10. Viola 13 



11. Cy pcrus 12 



12. Ranunculus 11 



13. Eupatoi ium 11 



14. IMianthus IO 



15. Asclepias 10 



Thus fifteen, or less than three per cent., of the genera furnish 

 271, or nearly 22 per cent, of the species. • 



Introduced Species. 



The whole number of introduced plants enumerated in the sub- 

 joined catalogue is 193, of which 15 are supposed or known to be 

 indigenous to other parts of the United States.* These are dis- 

 tributed through the several larger groups as follows: 



* These are the following : 



Xanthoxylum Americanum. Symphoricarpus racemosus. 



Trifolium repens. Symphoricarpus vulgaris. 



Pmnus ('In' Catalpa bignonioides. 



Rosa setigera. Madura aurantiaca. 



Philadelphus inodorus. Populus grandidentata. 



Ribes rotundifolium. Poa annua. 



Ribes rubrum. Pinus Strobus. 

 Passiflora incarnata. 



