274 Part III. Chapter 3. 
ı. Genera found in the Coast Mountains and not in the Sierra Nevada. (Those marked 
with * asterisks are peculiar to the Coast Mountains.) 
*Achlys, *Vancouveria, *Romneya, Papaver, Meconopsis, *Stanfordia, Caulanthus, Stanleya, 
*[someris, Frankenia, Mesembryanthemum, *Calyptridium, Abutilon, *Cneoridium, Euonymıs, 
*Adolphia, *Pickeringia (= Xylothermia), Amorpha, Acaena, *Tiarella, *Whipplea, *Tolmiaea 
(= Leptaxis), Viburnum, Linnaea, *Pentachaeta, *Heterotheca, Pluchea, Encelia, Viguiera, Jaumes, 
Venegasia, *Burrielia, *Actinolepis (= Eriophyllum in part), *Lasthenia (= Baeria in part), *Am 
blyopappus, *Blennosperma, Petasites, *Rafinesquia (= Nemoseris), Gaultheria, Menziesia, Mono- 
tropa, *Pholisma, Armeria, Microcala, *Loesilia, Romanzoffia, Petunia, *Micromeria, Synthyris, 
Calamintha (= Clinopodium), Mirabilis, Allionia, Boerhavia, *Nemacaulis, Lastarriaea, Aphanisma, 
Salicornia, Spirostachys, Dirca, Hesperocnide, Parietaria, *Simmondsia, Croton, Acalypha, Stillingia, 
Aristolochia, Cupressus, Calypso, Agave, *Brevoortia, *Hesperocallis, *Scoliopus, Lysichiton. 
2. Genera found in the Sierra Nevada not found in the Coast Mountains. (Those marked 
with an * asterisk are peculiar to the Pacific coast Flora.) 5 
conitum, Smelowskia, Parrya, Staphylea, *Chamaebatia, Purshia, Sibbaldia, *Carpenteria, 
Valeriana, Eupatorium, Sericocarpus, Rudbeckia, *Whitneya, *Hulsea, *Laurentia, Cassiope, 
Bryanthus, Kalmia, Sarcodes, Primula, Swertia, Styrax, Frasera, Draperia, *Hesperochiron, *Nama, 
Chamaesaracha, Mertensia. 
An examination of the first list will show that the Coast ranges lack those 
northern genera which may be called boreal-alpine, while the second list 0 
genera peculiar to the Sierra Nevada Mountains includes such boreal-alpine 
genera as Sibbaldia, Cassiope, Bryanthus. 
Outside floral elements enter and mix with the true endemic coast flora. 
The northern element from Oregon and Washington is practically coextensive 
with the redwood belt and extends, as far southward, as Marin County, althoug 
there are two considerable islands south of San Francisco Bay, one in the 
Santa Cruz Mountains and a smaller one in the Santa Lucia Mountains. Al 
of the typic redwood, or undergrowth plants are characteristically northert. 
We have here a mass invasion of a northern species-guild ("Arten 
genossenschaften”) into a redwood forest as an undergrowth, the redwood forest 
ns 
with its species-guild antedating by many periods of time the occupancy © 
the territorry. The undergrowth is an alien association thoroughly naturalized 
in its new quarters. The species characteristic of low altitudes are later in 
vaders and many of them have entered from the south. The Sonoran eie: 
ment overlaps the southern portion of the Coast Range between San Francise? 
Bay and Tehachapi Pass. In southern California, the Sonoran element reigN® 
supreme. Along the eastern edge of the Coast ranges where they abut = 
the great central valley of California, we find the influence of the coast rang“ 
flora extending eastward to the Sacramento and San Joaquin rivers. SI ; 
the flora of the plains is felt on the eastern slopes of the mountains. 
The district between the San Bernardino Range and the sea may 
signated as the Czismontane District. Two fairly distinct sub-distriet$ gi 
tories) are noticeable viz., the coastal territory and the interior territory WB & 
includes the San Fernando, San Bernardino and San Jacinto valleyS- he 
\the wide Los Angeles valley opens out to the sea the two territories UM 
| and some of the most characteristic coastal species are carried in 
| base of the San Gabriel Mountains. 
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