VOL. Iv. | Trees of Southern California. 339 
-Lyonothamnus floribundus, Quercus Engelmanni, and Pinus 
Torreyana may be regarded as endemic. The bare projection 
into this area of the Coast flora is indicated by isolated groups of 
Myrica Californica and Arbutus Menziesit. isculus Californica, 
Quercus Douglastt, O. Weslizent frutescens, and Pinus Sabiniana, 
belonging to this flora barely enter our territory from the San 
Joaquin region, and hence are forced into a narrow belt between 
the desert and the mountains, over which they have been unable 
to pass into a region better suited to them. 
DESERT AREA. 
Fremontia Californica* Chilopsis saligna* 
Dalea spinosa , Yucca baccata 
Olneya Tesota Yucca brevifolia 
Prosopts julifiora* Pinus monophylla 
Prosopts pubescens Juniperus Californica* 
Acacia Greggit* 
The close connection between this and the intramontane flora 
is shown by the fact that six of the above eleven species, desig- 
nated by an *, pass to a greater or less extent into the intra- 
montane district, while Populus Fremonti Wislizenz, of the former, 
passes into this desert. Pus Parryana, which barely enters this 
area, and perhaps IVashingtonia filifera, are prolongations of the 
Lower Californian subarea. 
In the following table is shown the distribution in the differ- — 
ent areas of the trees, separated according to their sizes: shrubs, 
and trees that barely enter the district being omitted. It will be 
seen that development is in accordance with the relative moisture 
of the different areas. The paucity of arboreal growth in the 
desert region is especially remarkable, when it is remembered 
that it is geographically the most extensive of the three. 
i ee ed ae ieee: __ [Mountain \Intramontane. |Desert.| Total 
Asicesuman up to 20 ue. Puss oa 4 5 a: bee, 
Small trees; up to 4 eee 3 9 oe 16 
Medium trees; under 100 feet..... 4 6 Eon © Ge 6 Oe 
Large trees; over 100 feet........ 6 fe) pot 
tAR ee a oe 17 20 | 8 1-45_ 
