Spring-shoots multinodal. Leaves binate, from 3 to 5 cm. long; resin-ducts medial, hypoderm biform. Conelets long-mucronate. Cones from 2 to 5 cm. long, sessile, ovate-conic, symmetrical or very oblique, persistent, serotinous; apophyses lustrous tawny-yellow, flat or protuberant, on oblique cones abruptly larger on the posterior face; the umbo armed with a slender fragile prickle. It grows from the valley of the Yukon, near the Alaskan boundary, along the Pacific coast to Mendocino county, California. It covers the plains and slopes of British Columbia and follows the Rocky Mountains into western Colorado, with an outlying station on the Black Hills of South Dakota. It grows on the Sierras and mountains of southern California and in northern Lower California. On the seashore this Pine is of low dense growth, but inland it is a slender tree with a long tapering stem. It is easily recognized by its very short leaves and very small cone. Plate XXXV. Fig. 305, Cones. Fig. 306, Leaf-fascicle and magnified leaf-section. [Illustration: PLATE XXXV. P. BANKSIANA (301-304), CONTORTA (305, 306)] 59. PINUS GREGGII 1868 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.