9 



Ulmus racemosa. Nowhere else, with us, have Quercus alba, Q. 

 obtusiloba and Q. macrocarpa appeared so abundantly. 



The table, which is appended to the Catalogue, is designed to show, 

 at one view, the number of genera and species in the several classes and 

 orders of plants represented in our Flora. It will be seen that quite 

 frequently one species is the sole representative of a genus or order, 

 elsewhere in the world abundant and important. Especially is this 

 true of the Phtznogamce. The entire number of species in that por- 

 tion of the vegetable kingdom, included in the Catalogue, is 1,217, 

 comprised in 106 orders. Of such species more than half the entire 

 number belong to the following 10 orders: 



Composites, - - - - 143 species. 



Cyperaceee, - - - - 105 species. 



Graminee, .... 88 species. 



Rosaceoz, - - - - - 52 species. 



Leguminosee, ... - 45 species. 



M enthaceee, - - - - - 39 species. 



Ranunculaceaz, - - 7 - 36 species. 



Cruciferce, - - - - 36 species. 



Orchidacece, .... 34 species. 



Liliaceee, - - - - 31 species. 



In all, .... 609 species. 



The largest genera, in the same division of plants, are Carex, 

 containing 72 species; Solidago, 20 species; Aster, 19 species; Poly- 

 gonum, 16 species; Salix, 14 species; Potamogeton, 12 species; 

 Viola, 11 species, and Habenaria, 10 species. Of trees, the genus 

 Quercus contains the greatest number of species: — nine. 



But it ought not to be inferred that the large number of species, 

 contained in a particular genus, is any indication that the plants of 

 such genus are especially abundant. Tilia Americana and Tsuga 

 Canadensis undoubtedly constituted a much larger share of our orig- 

 inal forest than the nine species of oak taken altogether. 



It would be very far from the truth to assert that the entire terri- 

 tory included within the limits of fifty miles from Buffalo has been 

 fully explored, and all its floral treasures brought to light. Much of 

 Wyoming and Genesee Counties remains to be examined. Except 



BUL. BUF. SOC. NAT. SCI. (2) APRIL, 1882. 



