898 
Journal of Agricultural Research 
Vol. XXVII, No. 12 
Table I .—Physicochemical constants for species of the Stanshury Mountains at higher 
altitudes —Continued 
Growth form and species. 
Date. 
Freezing 
point 
depres¬ 
sion, 
A. 
Atmo¬ 
spheres 
osmotic 
concen¬ 
tration, 
P. 
Specific 
electrical 
conduc¬ 
tivity, 
K. 
Ratio, 
conduc¬ 
tivity to 
depres¬ 
sion, 
K/A 
Chlo- 
rids 
per 
liter, 
Cl. 
herbs— continued 
Geranium richardsonii Fisch. & 
1920. 
Trautv. 
July 23 
O.78 
9.4 
O.0127 
O.O163 
1.1 
Heuchera flavescens Rydb. 
June 21 
O.87 
10.5 
.0119 
.OI37 
0.7 
Hydropkyllum watsoni (A. Gray) 
Rydb. 
...do . .. 
0.68 
8.2 
0T02 
0283 
0 7 
Lathyrus utahensis Jones. 
o -95 
XI -5 
.0174 
.0183 
- 0 
1.6 
Leptotaenia multifida Nutt. 
I - 3 I 
i 5-8 
.0175 
•0133 
1.1 
... do. 
i -35 
16.2 
.0238 
.0176 
1.1 
Average... 
. 
i -33 
16.0 
.0206 
•0155 
1.1 
Ligusticum filicinum S. Wats. 
July 23 
1.28 
I 5 - 5 
.0236 
.0184 
Mertensia foliosa A. Nels. 
June 21 
o -95 
11.4 
.0225 
.0238 
3-3 
Mimulus lewisii Pursh. 
July 23 
o -75 
9.0 
.0134 
.0179 
1.1 
Mitella stauropetala Piper. 
June 21 
o -93 
11.2 
.0169 
.0181 
o -3 
Penstemon procerus Dougl. 
...do. 
1.10 
13*3 
.0128 
.0117 
0.1 
Rudbeckia occidentalis Nutt. 
July 23 
0.90 
10.9 
.0152 
.0169 
1.4 
Senecio eremophillus Richards. 
0.74 
8.9 
.0193 
. 0263 
2.3 
Solidago pumila Nutt. 
...do. 
1.46 
17.6 
. 0221 
. 01 <1 
2.6 
Stellaria jamesiana Torr. 
June 21 
i-i 3 
13.6 
.0230 
.0204 
i -7 
Thalictrum sp. 
July 23 
1.67 
20.1 
.0209 
.0125 
1.8 
Veratrum speciosum Rydb. 
1.05 
12.6 
.0172 
.0164 
0.1 
Wyethia amplexicaulis Nutt. 
July 28 
1.19 
14*3 
.OI93 
.0163 
2.8 
Some of the differences between two or more determinations on the 
same species may be due to differences in the age of the leaves. In 
some instances the snow had but recently disappeared from the ground, 
and the leaves were much younger in the earlier than in the later of the 
two collections. This is true of the determinations on Populus and 
Opulaster. Some of the determinations are based on plants from stream 
banks, while others were obtained from the drier slopes. For present 
purposes it is not worth while to go into the details of local distribution 
of the montane vegetation, which is included merely as a basis of rough 
comparison with the desert habitats. 
Discussion of the results for the individual habitats will be reserved 
until they can be compared with others. This will be given in part in 
connection with the data of the following plant associations, and in part 
in a general summary. 
SAGEBRUSH ASSOCIATION 
In Tooele Valley the sagebrush association, which is one of the most 
important types of vegetation in the Great Basin region, occurs chiefly 
on the bench lands or upper outwash slopes which skirt the mountains. 
It is the characteristic plant covering of the alluvial fans which repre¬ 
sent the enormous accumulations of detritus swept out from the mouths 
of the canyons. From the agricultural standpoint, the sagebrush asso¬ 
ciation is of great interest, since it is upon this land that the dry-farm 
cultivation of the small grains is chiefly conducted. 
The lower limits of the sagebrush association are rather sharply de¬ 
fined, and are marked by the upper limits of the shadscale association, 
