P. densiflòra.
15. Pìnus densiflòra, Siebold. (Japan Pine.) Leaves about 4 in. long, from short, fringed, scale-like sheaths; rigid, convex above, concave beneath and somewhat serrulate on the margin, very smooth, sharp-pointed and crowded, shining green and somewhat glaucous; falling when one to two years old; 2 in a sheath. Cones abundant; 1½ in. long, short-peduncled, conical, obtuse, terminal, somewhat pendent; scales linear-oblong, woody, with a small prickle which soon falls off. A beautiful small tree, 30 to 40 ft. high; from Japan; hardy throughout.
P. resinòsa.
16. Pìnus resinòsa, Ait. (Red Pine.) Leaves 5 to 6 in. long, in twos, from long sheaths; rigid, straight, dark green. Cones 2 in. long, ovate-conical, smooth, their scales without points, slightly thickened, usually growing in clusters. A tall tree, 60 to 80 ft. high, with rather smooth, reddish bark and hard light-colored wood; branchlets also having smooth reddish bark. Pennsylvania, north and west.
P. ínops.
17. Pìnus ínops, Ait. (Jersey or Scrub Pine.) Leaves short, 1½ to 3 in. long, rigid; usually 2, rarely 3, in a short sheath. Cones solitary, 2 to 3 in. long, ovate-oblong, curved, on a short stalk. Scales tipped with a straight, rigid spine. A small tree, 15 to 30 ft. high, growing wild in sections where the soil is poor and sandy; having straggling flexible branches with rough, dark bark; New Jersey, south and west. Rarely cultivated.
