322 Part III. Chapter 4. 
ceae are endemic or western, except four species of Ribes, four of Kosa, 
Rubus strigosus, Potentilla fruticosa, Serbus (Pirus) sambucifolia, Prunus 
americana, P. pennsylvanica, Amorpha fruticosa, Rhamnus alnifolia, Negundo 
aceroides and Rhus glabra, which are also found in the east. "The two species 
of Vitaceae found in the Rockies, viz., Vitis vulpina and Ampelopsis ( Partheno- 
cissus) quinguefolia, extend to the Atlantic coast, and so also the three species 
of Elaeagnaceae. 
Taken as a whole, scarcely 20 per cent ofthe woody plants of the Rockies 
are found in the Alleghany Mountains, or around the Great Lakes. Nearly 
all those common to both regions are transcontinental, or boreal species. If 
on the contrary, the woody flora of the Rocky Mountains were compared with 
that of the mountains of the Pacific coast, one would find that at least 50 per 
cent of the former would be represented in the northern Cascade Mountains, 
which in British Columbia are more or less contiguous to the Rockies. 
Affinities of Californian Flora. It is important at this juncture to compare 
the flora of southern California with :that of other floras in order to represent 
the affinities of one of the phytogeographic regions of the Pacific coast. 
Southern California is chosen, because, we have available for such a comparison 
in the statistics compiled by PARISH'). 
The accompanying table exhibits Er relations of the native genera and species of southern 
California to the flora of North America. The number of each which extend beyond the North 
American continent is shown; and ni which are confined to it are separated into four geo- 
graphic subdivisions; namely, those whose range is restrieted respectively to southern California, 
to California, to the region west of the Rocky Mountains, and those which extend further east- 
ward. While the line has been drawn very strietly between plants which are, or are not ex- 
Genera Species 
Endemic Endemic 
———— 
Be = eg = 
Taxonomic Groups| = el & le: Es| 9823| & les ER 
| als a ls S8leälbr Else ea 
ss 28) 8 |%8| > 175158 | 88| 8 |38| 2 leg 
Aals<| 3 8545| F |ES|@8 2<| 3 153 aa 
ER ee ER = 
Gamopetalae ...... 13 | 54 | ı6| 6 | 89 | 127 || 22 | 250 |ı64 | 221 657 | 57 
‚Choripetalae er ) 221721 69 | 190 55 | 259 |207 187 708 TB. 
icotyledoneae. .. ... 22 96 | 27 | 13 Jı58 | 317 | 77:| og |371 | 408 1365 | 162 
Monocotyledoneae . 3 4 3 3 I 72 43 88 | go 32 | 205 | Bert 
permae ..... 25 | ı00 | 30 | 16 |ı1yı | 389 | 120 | 597 |4ıı | 440 | 1568 | 212 
Gymnospermae..... _ a N 6 — 5 2, 15 
Spermatophyta..... 25 | or | 30 | ı6 |ı7z2 | 395 || 120 | 610 |416 | 443 | 1589 BER 
Pteridophyta ...... — 1 | — 20 4 9 Be - 
Total | 25 | 101 | 30 | 16 |172 | 4ı5 || 124 | 619 |418 | 449 2620 25 
Per cent of native flora 4 17 5 4 1.30 et Er 24 87 . 
1) ParısH, S. B.: A Sketch of the Flora of southern California. Botanical Gazette xXXVl: 
203—222, 259—279. Sept. and Oct. 1903 
h 
Pc FAN 
a ng 
