vi. 260.
1889 P. latifolia Sargent in Gar. & For. ii. 496, f. 135.
1894 P. apacheca Lemmon in Erythea, ii. 103, t. 3.
1897 P. Mayriana Sudworth in Bull. 14, U. S. Dept. Agric. 21.
1897 P. scopulorum Lemmon in Gar. & For. x. 183.
1900 P. peninsularis Lemmon, W. Am. Conebear. 114.

Spring-shoots uninodal, sometimes pruinose. Bark-formation early. Leaves
prevalently in fascicles of 3, but varying from 2 to 5 or more, from 12
to 36 cm. long; resin-ducts medial, hypoderm uniform or multiform, outer
walls of the endoderm thick. Conelet mucronate, the mucro often
reflexed. Cones from 8 to 20 cm. long, ovate-conic, symmetrical,
deciduous and usually leaving a few basal scales on the tree; apophyses
tawny yellow to fuscous brown, lustrous, elevated along a transverse
keel, sometimes protuberant and reflexed, the umbo salient and forming
the base of a pungent, persistent prickle.

This species ranges from southern British Columbia over the mountains
between the Pacific and the eastern foot-hills of the Rocky Mountains,
including the Black Hills of South Dakota, to the northeastern Sierras
of Mexico, to northern Jalisco and Lower California, forming, in many
localities, large forests and furnishing the best Hard Pine timber of
the western United States. It attains its best growth on the Sierras
of California and is, next to P. Lambertiana, the tallest of the
Pines.

Like P. Montezumae, and under like influences, it shows much
dimensional variation, and the leaf-fascicles are heteromerous, with
the larger number in the southern part of its range. Many authors
consider the variety Jeffreyi Vasey to be a distinct species; but
here, it seems to me, too much importance is attached to the pruinose
branchlet, clearly a provision against transpiration and associated
rather with a dry environment than with a species. Most observers
discover many intermediate forms between this variety and the species.
The var. scopulorum Engelm. is the Rocky Mountain form with leaves in
2's and 3's and with small cones passing into P. arizonica, Engelm., a
more southern form with small cones and leaves in fascicles of 3 to 5.
The var. macrophylla (Shaw, Pines Mex. 24), in addition to its long
and stout leaves, bears a cone with protuberant apophyses, somewhat
comparable to the intermediate forms of P. pseudostrobus var.
apulcensis Shaw (l. c.). Fascicles of 6 and 7 leaves are sometimes