9. =Pìnus palústris=, Mill. (LONG-LEAVED OR SOUTHERN YELLOW PINE.) Leaves 3 together in bundles, 10 to 15 in. long, from a long, lacerated, light-colored sheath, of a bright green color, and crowded in dense clusters at the ends of the branches. Cones 6 to 10 in. long, usually cylindric, of a beautiful brown color, with thick scales, armed with very small, slightly recurved prickles. A rather tall pine, 75 ft. high, wild in the Southern States, and cultivated as far north as New Jersey, in sheltered situations. [Illustration: P. rígida.] 10. =Pìnus rígida=, Mill. (PITCH-PINE.) Leaves in threes, 3 to 5 in. long, from short sheaths; rigid and flattened. Cones ovate, 1 in. to nearly 4 in. long, sometimes in clusters; scales with a short, recurved prickle. A medium-sized tree, 40 to 70 ft. high, with hard, coarse-grained, very resinous wood; found east of the Alleghanies throughout; more abundant in swamps. [Illustration: P. Austrìaca.] 11. =Pìnus Austrìaca=, Höss. (AUSTRIAN OR BLACK PINE.) Leaves long, 3 to 5 in., rigid, slender, incurved, sharply mucronate, of a dark green color; from short sheaths; 2 together. Cones 2½ to 3 in. long, regularly conical, slightly recurved, of a light brown color; scales smooth, shining, with a dull spine in the center. A large cultivated tree, 60 to 80 ft. high, hardy throughout. Europe. [Illustration: P. Larício.] 12. =Pìnus Larício=, Poir. (CORSICAN PINE.) Leaves 4 to 6 in. long, slender, very wavy, dark green; 2 together in a sheath. Cones 2 to 3 in. long, conical, somewhat curved, often in pairs. Scales with very small prickles. Seeds rather large with broad wings. A tall, open, pyramidal, rapid-growing tree, 60 to 100 ft. high, with the branches in regular whorls, spreading and very resinous. Often cultivated. Europe. [Illustration: P. Massoniàna.] 13. =Pìnus Massoniàna=, Sieb. (MASSON'S PINE.) Leaves in twos, 4 to 6 in. long, rather stiff, concave on one side and convex on the other, twisted but not curved; sharp-pointed, of a fresh, bright green color. Cones 1 to 1½ in. long, conical, incurved, solitary but numerous, with closely overlapping scales terminating in slender prickles. An upright, compact tree, 40 to 50 ft. high, from Japan; sometimes cultivated. Hardy at Boston. [Illustration: P. mìtis.] 14. =Pìnus mìtis=, Michx. (COMMON YELLOW PINE.) Leaves sometimes in threes, usually in twos, from long sheaths; slender, 3 to 5 in. long, dark green, rather soft. Cones ovate to oblong-conical, hardly 2 in. long; the scales with minute weak prickles. A large tree with an erect trunk, 50 to 100 ft. high. Staten Island, south and west. The western form has more rigid leaves, and more spiny cones. [Illustration: P. densiflòra.]