GENEEAL REPORT. xliii 



orders, 134 genera and 305 species. By far the largest order is the Com- 

 posiia, to which belong 28 per cent, of the genera and one-fifth of the 

 species, somewhat more than half, both of genera and species, being senecioid 

 and one-fourth ligulate. The Cruciferce, Graminece, and Scrophulariacece 

 follow in the number of their genera, making more than half of the whole, 

 but the numerous Astragali and EriogonecB place the Leguminosce and 

 Polygonacece in advance in respect of species, which orders with the Cruci- 

 fercB and Scrophulariacece form one-half The Polemoniacece, HydropTiyllacem, 

 OnagracecB, ChenopodiacecB and Borraginacece are also large orders with from 

 three to six per cent, of species. This group is decidedly western and 

 southern, less than five per cent, appearing on the Atlantic slope, while 55 

 per cent, are on the Pacific side and nearly one-third extend to Arizona 

 or beyond. 



In the mountain flora of the Basin there are 51 orders, 191 genera and 

 393 species. The composites, though less predominent than in the last group, 

 have yetmore than 18 per cent, of the species and over 17 per cent, of the 

 genera, half of which genera and nearly half the species are senecioid, 27 per 

 cent, of the genera and 35 per cent, of the species being asteroid. The 

 proportion of the other orders has changed largely, the relative increase 

 being greatest in the Rosacece, Garyophyllacece, and Saxifragacece, and some- 

 what less in the Liliacece, Ericacece, Coniferce, and JJmhellifercB, with but little 

 increase or even a diminution of numbers in the other more prominent orders. 

 Seven orders have now to be joined with the Compositce to form half of the 

 genera and species, viz : Leguminosce, Cruciferce, Rosacece, Graminece, Scrophu- 

 lariacece, Polemoniacece and RanunculacecE — the last equaled in species by the 

 Caryophyllacece, Saxifragacece and Polygonacece. 



The tendency of the range is, as was to be expected, toward the north 

 and northwest. The number of Pacific species is nearly 70 per cent., to 22 

 per cent, upon the Atlantic side ; only 9 per cent, are known as southern, 

 but nearly 30 per cent, are arctic or subarctic, and as large a proportion alpine 

 or subalpine. 



If the species found in the Wahsatch and Uintas be included the 

 results are somewhat changed ; the proportion of Compositce is reduced to 

 one-sixth of the species and one-seventh of the genera, and the Leguminosce 

 are followed in number of species by the Cyperacece, Rosacem, Graminece, 

 Caryophyllacece,, Ranunculacece and Scrophulariacece. The proportion of 



