Pinus Pinus, Douglas ex P. & C. Lawson

5. P. ponderosa Douglas ex P. & C. Lawson View in CoL , Agric. Man. 354 (1836).

U p to 75 m; bark becoming very thick, yellowish or dark reddish-brown. Buds cylindrical, resinous. Twigs glabrous, at first brownish or greenish, becoming blackish. Basal sheath of short shoots more than 15 mm. Leaves 100-250 x 1-5 mm, in groups of 3 (rarely 2 or 5), rigid, curved, densely crowded, deep yellow-green, very aromatic; resin-canals median. Cones 8-15 x 3-5-5 cm, ovoid, symmetrical, subsessile, patent or slightly deflexed; apophysis concave or plane; umbo with strong, erect, persistent mucro. Seed c. 8 mm; wing c. 18 mm. Occasionally planted for timber in C. & S. Europe. [Au Ge G r It Rm.] (IF. North America.)

P. jeffreyi Grev. & Balf. in A. Murray, Bot. Exped. Oreg. 2 (1853), from W. N orth America, a tree up to 40(-60) m, with non-resinous buds, glaucous twigs, greyish-blue-green leaves 120-200 mm, cones 15-25 cm, and the umbo with recurved mucro, is also occasionally cultivated, sometimes under the name of P. ponderosa .

P. sabiniana Douglas , Trans. Linn. Soc. London (Bot.) 16: 749 (1833), from California , a tree up to 15(—25) m, with lax habit, sparse, pale green leaves 200-300 mm, and cones 15-25 cm, is cultivated for timber on a small scale in Europe.