98 
IOWA ACADEMY OF SCIENCES. 
PINUS ALBICAULIS ZONE. 
The Pinus albicaulis extends down into the canon, but 
attains its great development on the flats and slight slopes, 
the highest points being between 8,500 and 9,000 feet. The 
species is frequently dwarfed, but not nearly so much as 
the Spruce at a higher altitude. At points below 8,500 
feet it is somewhat stunted, attaining a considerable diam- 
eter and low height as the following table will show. 
HEIGHT AND DIAMETER OP THE PINUS ALBICAULIS, NORTH 
FORK OF HORSE CREEK. 
Location. 
Height. 
Diameter. 
Altitude. 
Flat 
50 feet 
2 feet 
8,500 
8,500 
8,500 
North slope 
60 feet 
feet 
2| feet 
West slope 
50 feet 
The percentage of conifers is shown in the following 
table: 
DOMINANCE OF SPECIES IN PINUS ALBICAULIS ZONE. 
Species. 
Per Cent. 
Altitude. 
Location. 
Pinus murrayana 
< ( (4 
24.5 
7,800 
Flat. 
23.2 
8,000 
Flat. 
4 4 4 4 
22.2 
8,500 
Flat. 
4 4 4 1 
68.4 
8,500 
Slight slope north. 
4 4 4 4 
2 40 
8.000 
Slope to north, side hill. 
Pifi us a Ibicaulis 
50.4 
7,800 
Flat. 
‘ ‘ ‘ ‘ 
58.8 
8,000 
Flat. 
( < « < 
60 
8,500 
Side slope, north. 
< < ( ( 
80 
8,500 
Side slope, north. 
It <1 
J5.2 
8,500 
Side slope, north. 
‘ ‘ ‘ ‘ 
33.3 
8,500 
Side slope, north. 
(1 It 
66.6 
8,500 
Side slope, north. 
Abies subalpina 
9 
7,800 
Side slope, north. 
17.4 
7,800 
Side slope, north. 
4 i 4 4 
40 
8,500 
Flat. 
4 4 4 4 
12.9 
8,500 
Flat. 
4 4 4 4 
33.6 
8,000 
Side hill, slope north. 
4 4 4 4 
5 
8,000 
Side hill, slope north. 
4 4 4 4 
12.9 
8,000 
Side hill, slope north. 
Picea engelmannii 
4 4 4 4 
13.5 
7,800 
Flat. 
0 
8,000 
Flat. 
4 4 4 4 
20 
8,500 
Slight slope north. 
4 1 4 4 
33.6 
8,000 
Side hill, slope to north. 
4 4 4 4 
60 
8,000 
Side hill, slope to north. 
