a
Cones straight 58. contorta
Cones and leaves much longer, more than 7 cm.
Posterior cone-scales gradually larger than
anterior scales.
Bark-formation late 59. Greggii
Bark-formation early 60. patula
Posterior cone-scales abruptly larger than
anterior scales.
Cones with very stout spines 61. muricata
Cones with minute or deciduous prickles.
Bark-formation late 62. attenuata
Bark-formation early 63. radiata

48. PINUS PRINGLEI

1905 P. Pringlei Shaw in Sargent, Trees & Shrubs, i. 211, t. 100.

Spring-shoots uninodal, sometimes pruinose. Leaves ternate, from 15 to
25 cm. long; resin-ducts internal or with an occasional septal duct,
hypoderm biform, in thick masses, often projecting far into the green
tissue and sometimes touching the endoderm. Conelets mucronate. Cones
from 5 to 10 cm. long, reflexed on a rigid peduncle, subsymmetrical or
more or less oblique, tenaciously persistent, often serotinous;
apophyses sublustrous tawny yellow or fulvous brown, convex, the
posterior scales often more prominently developed, the mucro usually
wanting; seed with a perceptibly thickened wing-blade.

A tree with long erect bright green foliage, confined, so far as
known, to the subtropical altitudes of western Mexico. As it grows in
Uruapan, Michoacan, there are two forms of the cone, large and small,
both with the same long rigid leaf.

Plate XXXI.

Figs. 268, 269. Three cones and seed. Fig. 270, Leaf-fascicle and
magnified leaf-section.

49. PINUS OOCARPA

1838 P. oocarpa Schiede in Linnaea, xii. 491.
1842 P. oocarpoides Lindley ex Loudon, Encycl. 1118.

Spring-shoots uninodal, pruinose. Leaves in fascicles of 3, 4 or 5, from
15 to 30 cm. long, erect; resin-ducts mostly septal, sometimes internal,
hypoderm biform or multiform. Conelets on very long peduncles,
mucronate. Cones from 4 to 10 cm. long, long-pedunculate, broad-ovate to
ovate-conic, symmetrical or sometimes oblique, persistent, more or less
serotinous; apophysis gray-yellow or greenish yellow of high lustre,
flat or variously convex, delicately and radially carinate, the umbo
often salient, the prickle usually broken away; seed-wing appreciably