874 
Journal of Agricultural Research 
Vol. XXVIII, No. 9 
Table IX .—Freezing point depressions and osmotic pressures of. the sap of herba¬ 
ceous plants, including grasses and a moss on Big Cottonwood Canyon water¬ 
shed, classified by species, type, situation, altitude, and date of collection —Con. 
[Figures in italics represent averages of two or more determinations] 
Species and type 
Situation 
! 
1 Alti¬ 
tude 
Date of 
collection 
Depres 
sion of 
freezing 
point 
Os¬ 
motic 
l pres¬ 
sure 
Lupinus alpestris A. Nels. 
Spruce-fir... 
Northern aspect 
Feet 
10,000 
8,900 
1920 
July 15 
Sept. 9 
Degreet 
C. 
0.90 
1.09 
Atmos¬ 
pheres 
10.8 
13.1 
Do... 
Eastern aspect 
Machaer anther a viscosa (Nutt.) Greene 
Chaparral. 
Southern aspect 
7,600 
Sept. 7 
1.86 
22.4 
Macronema watsoni (A. Gray) Greene 
Chaparral..... 
Southern aspect 
6,400 
Sept. 22 
1.72 
20.7 
Madronella oblongifolia Rydb. 
Spruce-fir. 
Ridge-top 
10,000 
9,000 
July 15 
Sept. 9 
1.15 
1.02 
13.8 
19 ^ 
Do. 
Eastern exposure, open,... 
Mertensia sampsonii Tidestrom 
Aspen-fir... 
Northern aspect 
7,600 
10,000 
9,000 
July 13 
July 15 
Sept. 9 
1.00 
0.83 
0.97 
12.0 
10.0 
11.7 
Spruce-fir. 
Ridge-top 
Do.... 
Eastern aspect, open 
Mimulus guttatus DC. 
Spruce-fir. 
Wet meadow 
8,800 
July 25 
0.58 
7.0 
OrthocarpuS tolmiei H. & A. 
Aspen-fir__ 
Lower southern aspect. ... 
Northern aspect open 
7,450 
8,860 
Sept. 7 
Sept. 9 
1.87 
1.76 
22.5 
21.2 
Spruce-fir..... 
Pentstemon cyananthus Hook. 
Spruce-fir__ 
Northern aspect open. 
8,800 
July 25 
1.40 
16.8 
Pentstemon Tmmilis Nutt. 
Chaparral... 
Southern aspect. 
7,600 
July 26 
2.05 
24.6 
Polemonium occidentale Greene 
Aspen-fir_ 
Northern aspect 
7,600 
July 19 
1.15 
13.8 
Potentilla filipes Rydb. 
Aspen-fir. 
Northern aspect 
7,600 
July 13 
1.21 
14.6 
Potentilla nuttallii Lehm. 
Spruce-fir___ 
Northern aspect, wet 
ground. 
8,950 
Sept. 9 
0.87 
in n 
Ranunculus maximus Greene 
1U. o 
Spruce-fir...... 
Northern aspect, 
8,800 
July 25 
1.05 
12.6 
Rudbeclda occidentalis Nutt. 
Aspen-fir.. 
Northern aspect 
7,450 
8,900 
July 19 
Sept. 9 
0.91 
0.91 
11.0 
11.0 
Spruce-fir______ 
Eastern aspect 
Sedum stenopetalum Pursh. 
Aspen-fir... 
Southern aspect 
7,450 
7,450 
July 26 
Sept. 7 
0.53 
0.70 
6.4 
8.4 
Do... 
Senecio serra Hook. 
Aspen-fir... 
Northern aspect 
7,450 
July 26 
0.92 
11.1 
Solidago trinerrata Greene 
Chaparral.. 
Southern aspect. 
6,400 
Sept. 22 
2.27 
27.3 
