ern limit is in southwestern Wyoming, central
Colorado, Texas, western Tamaulipas and northwestern Vera Cruz. It
ranges over Utah, Nevada, Arizona and the northern states of Mexico to
the southern Sierras of California and to the northern and southern
extremities of Lower California. It is recognized by its small cone,
which expands, when open, into an irregular flat aggregate of loosely
attached scales. The leaves are shorter than those of the other Pines
of this group.

The cone of this species always retains its peculiar character. The
variations are mainly in the number of leaves in the fascicle. On this
character this Nut Pine is divided by many authors into four
species--cembroides, with three slender leaves--edulis, with two stout
leaves--monophylla, with one leaf and--Parryana, with four stout
leaves. But there are intermediate forms that may be either cembroides
or edulis, edulis or monophylla etc., and Voss's reduction of the four
to a single species with three varieties seems to be justified (Mitt.
Deutsch. Dendrol. Ges. xvi. 95).

Plate XIII.

Fig. 130, Cone, cone-scale and seed. Fig. 131, Open cone. Fig. 132,
Branchlet with leaves and magnified leaf-section.

14. PINUS PINCEANA

1846 P. cembroides Gordon in Jour. Hort. Soc. Lond. i. 236, f.
(not Zuccarini).
1858 P. Pinceana Gordon, Pinet. 204.
1882 P. latisquama Engelmann in Gard. Chron. ser. 2, xviii. 712.
f. 125 (as to cone only).

Spring-shoots slender, pruinose. Leaves in fascicles of three, the
sheath revolute at the base, then deciduous; stomata ventral, or ventral
and dorsal; resin-ducts external. Scales of the conelet minutely
mucronate. Cones from 6 to 9 cm. long, cylindrical, pendent on long
peduncles; apophyses lustrous ochre-yellow, elevated in the centre,
the umbo usually retaining the small prickle; seed large, bearing on its
dorsal surface remnants of the spermoderm.

A small bushy tree with long slender branchlets, clear gray cortex,
persistently smooth except on the lower part of the trunk, and
glaucous-green foliage. It grows along water-courses, dry in autumn
and winter, from southern Coahuila to central Hidalgo, and is
associated with P. cembroides, from which it may be distinguished by
its longer leaves and much longer cylindrical cone.

Plate XIII.

Fig. 127, Cone, cone-scale and seed. Fig. 128, Branchlet with
leaves