4 
pbylli and Homalobi. E 
The Oregon-Washington coast region is a normally forested area 
with ro distincitve flora and no Astragaline importance, 
The Siskiyou region of southern Oregon is a very small and iso: 
lated area caused by barriers and rather low humidity but not worth 
any special treatment here. 
The Great Basin region belongs with the Pacific group and is 
easily separated into tbe Bonneville and Lahontan, or the eastern and 
western part, embracing the area that does not drain to the Colorado 
or the Columbia. It is a high plateau region with parallel mountain 
r?nges about a mile high every twenty miles and running north 
and south, bounded on the north by the low sagebrush and juniper 
hills of the Columbia drainage, on the east by the lofty Wasatch 
range and its Wasatch Plateau extension at the south, on the south 
by no barriers but the Tropical climate of the Colorado and on the 
west by the Sierras, The flora is quite different from other regions. 
There is much intergrading at the north, some at the east and west 
end little at the south. 
The annual temperature ranges from 53 degrees to 50 degrees 
on the floor, the humidity from 25 per cent to 49 per cent. and rainfall 
from 6 to 13 inches on the floor. The soil is gravelly, with very 
little sand, and there are wide areas in the centers of the valleys with 
elkaline clays. There is no river system except the Humboldt on 
the west and the Jordan, Sevier, and the Bear on the east. It is a re- 
gion of seattered springs and short sinking streams. The upper Snake 
river region has much in common with the Great Basin but really be- 
longs in the Columbia drainage. . Its flora has a few peculiarities, 
The Bonneville section is characterized in its Astragaline flora by 
ine great development of the Argophylli, to which its soil and ele- 
vation are peculiarly adapted. The alkaline areas have few snecies 
A. Toanus being about the only peculiar species, though A. tetrap- 
terus grows where there is a little alkali. A. Wardii and serpens 
are other peculiar species of the Sevier region. The Lahontan sec- 
tion is characterized by an excessive development of the Podo-sclero- 
carpi in the alkaline part, such as A. Serenoi, a canonis, pterocarpus, 
Casei: the Malaci occur on the gravelly mesas, also Anlersoni, Gib- 
bsii, etc. 
The Mojave-Cclorado river region from Springdale Utah to the 
Sierras and southward to Mexico contains a peculiar flora, with many 
local branches and yet all are connecied in a general whole hard to 
separate. The region is one of great temperature and mininum hu- 
midity and almost no rainfall. Its flora appears only in the spring 
and often for years at a time does not develop at all worth mention. 
Each subdivision of the region has a few. pralongus, forms of Jenti- 
ginosus and amphioxys, Laynez, Zionis, remulcus. The Amargosa 
Desert-Death Valley region has A. Mohavensis, albens, Panamintensis, 
triquetrus, acutirostris. The Mojave-Salton Sink region has A. lima- 
tus, Vaseyi, aridus, Thurberi, Palmeri, ete. The soil of this region 
is almost wholly sand, There are many forms of A. lentiginosus, an 
other more widely distributed species. 
The Arizona-New Mexican floor has a similar climate to the above 
but very different in the summer and fall rains which clothe the 
plains with verdure. Many species of Astragalus grow there, but 
few are local. We have A. nothoxys, Arizonicus, tephrodes, ete, The 
soil is mostly sand on the floor and gravel on the slopes. This belongs 
to the fourth grand division. 
The Texan plains belong in the same division of fall rains and 
have a number of peculiar species, mostly annuals, such as A. lepto- 
carpus, Lindheimeri, Brazoensis, reflexus, giganteus, Wrightii, etc. 
. The Mexican Plateau is also a division of fall rains and has in- 
