Affinities: Mexico, Central America, West Indies. 325 
proportional distribution of Mexican and Central-American species in South 
America and the West Indies according to Hemsley is displayed in the accom- 
panying table. 
Western | Numbers of 
RE Br t Western Eastern and South American 
w Be di ei I Ei outh out Eastern | types reaching 
: : Be 2 a America America South Mexico or Gua- 
ar Aa Hotid only only America itemala, but not 
ee only the West Indies 
Polypetalae .... 190 55 143 66 212 | 265 
Gamopetalae ..... 182 112 129 65 80 177 
Incompletae .... 97 43 36 30 34 72 
Monocotyledoneae . 179 7E 64 99 103 183 
Gymnospermae... _ 3 2 I — I 
Totals | 648 284 | 374 261 429 698 
It should be mentioned that the divisions of South America into eastern 
and western regions is a very rough one, the main object in view being the 
separation of the western and Andine elements from the eastern. Thus Vene- 
zuela is reckoned eastern, and New Granada western. 
Of the 1849 genera of vascular plants represented in Mexico and Central 
America, 787 recur in some part or parts of the old world, or in the Pacific 
islands, and of these, no fewer than 609 range widely, leaving only 178 which 
are restricted to one country or region outside of America. Of the 12,233 species, 
454 extend beyond America; 337 of them are widely diffused, and the rest, 
117 in number, are of comparatively limited range. 
Affinities of the Famaican Flora. The affınities of the flora of Jamaica to 
the other Antillean islands and the mainland displayed below was obtained by 
taking Fawcett’s provisional list of the indigenous and naturalised plants of 
Jamaica (1893) and checking off the plants found also in the other islands and 
the mainlands adjacent. As this list is largely based on GRISEBACH, and as the 
other lists used also conform more or less closely to his nomenclature, the 
data necessarily, owing to our lack. of information, are very incomplete and 
diserepancies occur. The following figures, however, have been given with 
the understanding that they suggest probable affınities, rather than absolute 
relationship, because the incomplete state of our knowledge of the flora of the 
est Indies and the absence of a complete systematic manual for any of the 
larger islands prohibits an exact statement of the facts. The true relationship 
01 the flora of these several islands to Jamaica is only determined by excluding 
the littoral plants, weeds and other naturalized plants, as also the species of 
2 wide range common to a number of the islands and the mainland (Fig. 16). 
The tabular matter expresses the relationship of the flora of Jamaica to Haiti, 
Cuba, the Bahamas, St. Croix, the southern United States, Mexico and Central 
lerica, Some peculiarities are worthy of mention which elucidate the probable 
Dr geographic distribution of the species, which comprising the Jamaica flora 
te found on other of the Antillean islands and the mainland. In the table. 
