68 P. Greggii Engelmann ex Parlatore in DC. Prodr. xvi-2, 396.

Spring-shoots uninodal and multinodal, pruinose. Bark-formation late,
the branches and upper trunk smooth. Leaves ternate, from 7 to 10 cm.
long, erect; resin-ducts medial, hypoderm of uniform thin-walled cells.
Conelets mucronate. Cones from 6 to 12 cm. long, ovate-conic, oblique,
serotinous, reflexed; apophyses lustrous tawny yellow, convex, the
posterior gradually larger and more prominent than the anterior scales,
the umbo flat or depressed, the mucro deciduous.

This species is known, at present, from specimens collected in the
vicinity of the city of Saltillo, in northeastern Mexico. Were it not
for the difference of bark it might be considered to be a northern
variety of P. patula with shorter erect leaves. With both species the
long peduncle of the conelet becomes overgrown by the basal scales of
the ripe cone, which appears to be sessile. With both, the cones are
in crowded nodal clusters, reflexed against the branch. They are so
much alike that earlier descriptions of P. patula included the smooth
gray bark of P. Greggii. The first correct description of the scaly
red bark of P. patula appeared in the second edition of Veitch's
Manual of Conifers.

Plate XXXVI.

Fig. 311, Cone. Fig. 312, Conelet. Fig. 313, Leaf-fascicle and
magnified leaf-section. Fig. 314, Branch showing erect leaves.

60. PINUS PATULA

1831 P. patula Schlechtendal & Chamisso in Linnaea, vi. 354.

Spring-shoots multinodal, more or less pruinose. Bark-formation early,
the scales deciduous, the upper trunk and branches red. Leaves
prevalently ternate but sometimes in fascicles of 4 or 5, from 15 to 30
cm. long, slender and gracefully drooping; resin-ducts medial or with an
occasional internal duct, hypoderm weak, of uniform thin-walled cells.
Conelets mucronate. Cones from 6 to 11 cm. long, in crowded verticillate
clusters, sessile, reflexed, ovate-conic, oblique, persistent and
serotinous; apophyses lustrous nut-brown, more or less tumid, the
posterior gradually larger than the anterior scales, the umbo flat or
depressed, the mucro wanting.

Patula grows in the warm-temperate climates of Hidalgo, Puebla and
Vera Cruz, in eastern and central Mexico. It can be at once recognized
by its slender drooping foliage, its persistent cones, and its red
upper trunk. It is cultivated in northern Italy and in the warmer
parts of Great