IS 
BOTANY. 
BOTANY OF THE DES CHUTES BASIN. 
The botany of this area has the general characters of that of Klamath basin, except that, as 
we descend towards the Columbia, the forest of yellow pine gives place to scattered trees of the 
western cedar, which are, in time, succeeded by a growth of bunch grass, covering the country 
as exclusively as does the wild oat the valleys of California. Near the Columbia, the streams 
are bordered by Quercus garryana , which does not, however, here attain the size of the same 
species in the valleys of the Willamette and Umpqua. 
BOTANY OF THE CASCADE MOUNTAINS. 
As has been mentioned, the general features of the botany of the Cascade mountains is 
similar to that of the Sierra Nevada of California, the greater portion of the species which 
compose it extending southward as far as San Francisco. There are, however, many species, 
both of trees and minor plants, which, quite local in their range, yet in certain districts repre¬ 
sented by great numbers of individuals, give a peculiar character to the prevalent vegetation. 
There are other plants, which, common in the vicinity of the Columbia, do not extend south¬ 
ward below the California line. Of these the western larch, ( Larix occidentals,) and Abies 
Williamsonii may be taken as examples. 
LOCAL BOTANY. 
In the vicinity of the Three Sisters we several times crossed and recrossed the main crest of 
the Cascade mountains, and were able to study, very carefully, the different belts of vegetation 
visible on the mountain sides, from the snow line down to the Des Chutes basin, on the east, 
and to the Willamette valley on the west. At this point, the plain bordering the Des Chutes, 
having an altitude of about 4,000 feet, is covered with a continuous forest of yellow pine. 
Along the streams coming down from the mountains are a few trees of the western larch, 
nowhere in this vicinity found at a much greater elevation than the plateau I have mentioned. 
With the larch are occasionally mingled Populus tremuloides, P. monilifera , and P. angustifolia. 
A few hundred feet up the mountain side the yellow pine is joined by the sugar pine and Pinus 
contorta , the western balsam fir, and Douglas’ spruce, all of which combine to form a thick 
forest. With these also are occasionally seen few and small trees of the western Arbor vitce, 
(P. gigantca,) and the large-leaved maple, ( Acer macrophyllum.) A little higher we found Pinus 
monticola of Douglas, to me scarcely distinguishable from the white pine of the eastern States, 
and the silver fir, ( Picea amabilis .) At the height of 6,000 feet the trees which I have 
mentioned had all given place to Abies Williamsonii and Pinus cembroides, which rise to the line 
of perpetual snow. As we descended toward the west these two species were again succeeded 
bv those I have mentioned as occurring on the eastern slope, but mingled in'different numerical 
proportions, the most abundant species, and those constituting the great mass of the forest, 
being the Douglas spruce, the balsam fir, and the western Arbor vitce. Here we found, for the 
first time, the Noot.lca cypress , which was confined to the western slope of the mountains. The 
under shrubs of the forest, on the western slope, consisted of the chinquapin ( Castanea chryso- 
phylla,) Rhododendron , two species, Ardostaphylos tomentosa, and Spiraea aricefolia, the ground 
being covered with Berberis , “Salal,” and ferns, as in the forests of the coast mountains, to 
which that of the western slope is like in all essential particulars. On the alpine summits of 
