SUMMAEY AND ANALYSIS OF THE FLOEA. 221 



Numbers and Percentages of Species of Phanerogamic Plants extending 



beyond Mexico and Central America. 



Number. Per cent. 



Extending to other parts of America 3433 29-5 of 11626 



Eestricted to America 3085 89-9 of 3433 



Extending to the Old World and Pacific Islands 348 10-1 



3433 100-0 



Contrary to what obtains for genera, there is a high percentage of endemic species in 

 Mexico and Central America, though not quite so high perhaps as in Australia and in 

 extratropical South Africa. In West Australia the specific endemic element is 85 per 

 cent, of the whole phanerogamic flora, and in Bolus's " South-western region " of the 

 South-African flora it is perhaps nearly as high ; while Grisebach's investigations of the 

 West-Indian flora give only about 50 per cent. Without making a separate and very 

 laborious calculation, we cannot say precisely what the proportions are in South Mexico, 

 but from a rough approximation we have no hesitation in fixing the endemic element 

 at over 80 per cent, of the whole, especially as 81*7 per cent, of the endemic species 

 are restricted to Mexico, Guatemala, and Honduras, as opposed to 13"1 per cent, in 

 Nicaragua, Costa Rica, and Panama. 



We now pass to the percentages of species in the various regions and areas designated 

 in the previous Tables. 



Numbers and Percentages of Species of Phanerogamic Plants in each division : 



total 11626 * 



Number. Per cent. 



North Mexico 2930 25-2 of 11626 



South Mexico and Uncertain 7546 64-9 



Guatemala 1337 11-5 „ 



Honduras 152 1-3 „ 



Nicaragua 843 7*3 „ 



Costa Rica 1086 9-3 „ 



Panama 1436 12-4 „ 



Numbers and Percentages of Species of Phanerogamic Plants extending to other 



parts of America: total 3433. 



Number. Per cent. 



North-west America 1125 32-7 of 3433 



North-east America 553 16-1 „ 



South America 1957 57*0 „ 



West Indies 1219 35-5 „ 



Restricted to America 3085 89-8 „ 



* It may be explained that the figures in these Tables do not check themselves by making totals of 100, 

 because of the occurrence of the same species in more than one area ; yet those relating to extensions beyond 

 America come very near doing so, inasmuch as nearly all the species not belonging to the category of widely 

 diffused are limited to one country in the Old World. 



2g2 



