276 BOTANICAL GAZETTE | OCTOBER 
REGIONAL DISTRIBUTION OF GENERA AND SPECIES. 
GENERA SPECIES 
Endemic Endemic 
TAXONOMIC 
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CATEGORIES & 7 ‘ a & ” “ é 
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oh Boy o = 2 = ak lee ae 2 ° ae ~ oe he 
Be( 8s] 5 | ea] € | kell be | se | 3 | Ba] & | ea 
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z<q|B2| 5 [a5] & | ad lla<|ez| 6 |ad| & | ad 
Gamopetalae...... x3 54 16 6 89 | 127 22 | 250 | 164 | 221 657 | 57 
Choripetalae.......] 9 42 7 69 5 | 259 | 207 | 187 708 5 
cotyledones...... 22 96 27 13 | 258 | 317 77. | 509 | 371 | 408 | 73705 | 162 
ioranen 3 4 4 3 13 72 3 88 40 2 
Angiospermae...... 25 | 100 30 16 | 777 | 389 || r20 | 597 | 41x | 440 | 7508 | 212 
Gymnospermae..... I a 6 13 ae 
rm gg ee 25 | ror 30 16 | 272 | 3905 120 | 610 | 416 | 443 | 7589 | 212 
Pteridophyta. .... . dea ee as — 20 4 9 2 6 2m | 20 
TOTAL espe eset ae: OF 30 20) 272 || gre 124 | 619 | g18 | 449 | rOr10 | 232 
Per cent. of native 
MOIR. a5 65. scc'e8| 17 5 3 30 Jo 6 33 23 24 87 | 12 
are restricted to California. It will also be noticed that the 
geographical specialization rapidly increases in passing from the 
lower to the higher taxonomial groups. Thus all the genera of 
Pteridophyta extend beyond the North American continent; of 
the seven genera of Gymnospermae only one is exclusively 
North American; of the Monocotyledones 15 per cent. are North 
American, but of the Choripetalae 26 per cent., and 41 per cent. 
of the Gamopetalae. 
Naturally this local differentiation is much more pronounced 
in the species than in the genera. Less than one-eighth of the 
indigenous species extend beyond North America. Among 
the North American species less than 8 per cent. pass beyond 
the Rocky Mountains ; of the species occurring west of that 
range nearly 60 per cent. are exclusively Californian; of the 
Californian species over one-half are confined to the southern 
counties. In the Pteridophyta the species are about equally 
divided between North American and those of wider distribution; 
the development of the Gymnospermae is entirely North Ameri- 
can; the Monocotyledones are 80 per cent. North American, the 
Choripetalae 88 per cent., and the Gamopetalae 92 per cent. 
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