Le. 
The Species of the Genus Larix. 23 
SARGENT: Silv. N. Am. XII, 1898, . 11, t. DXCIV. — REHDER: 
Man. Trees and Shrubs, 1927, p. 51. — 
Syn: 
Pinus Nuttallii, PARLATORE in De Candolle, Prodr. XVI, 2. part, 
1868, p. 412. 
L. occidentalis together with L. Lyallii are representatives 
in North America of the type of larch characterised by 
possessing cones, the bracts of which are longer than the 
cone-scales, even when the cones attain maturity. Both 
species are indigenous to the most westerly parts of North 
America, where they are vicarious, L. occidentalis being a 
native of the mountains at an altitude of between 600 and 
2100 meters, while L. Lyallii is an alpine tree, holding 
itself to the neighbourhood of the forest line between 
1200 and 2400 m. above sea-level. 
L. occidentalis is a valuable tree, which can attain very 
considerable dimensions under suitable conditions, namely, 
on fertile, deep soil in vallies. It occurs in Western Canada 
(British Columbia), and reaches its highest pitch of devel- 
opment in a section of the most north-easterly part of the 
State of Washington, the extreme west of Montana, and 
the northern parts of Idaho, where whole forests of it are 
often to be met with; while it is often found growing 
among Thuja plicata, Pseudotsuga mucronata, Tsuga Alber- 
tiana, Picea Engelmanii, and Abies grandis. In the most 
suitable localities, it can attain a height of 50—80 m. (Sar- 
GENT: Silv. N. Am. XII, 1898, p. 11; REHDER, 1927, p. 51), 
but as a rule it is less than 50 m. high. The girth may 
also be considerable, and trunks are mentioned having a 
diameter of up to 2 m. (Henry & Erwes: 1907, p. 394), 
and about 2,5 m. (SARGENT: 1898, p. 11). Such girths are, 
of course, considerable, but not so enormous in relation 
