176 



TREES OP THE NORTHERN UNITED STATES 



bright green color. Cones 1 to 1^ in. long, 

 conical, incurved, solitary but numerous, 

 with closely overlapping scales terminat- 

 ing in slender prickles. An upright, com- 

 pact tree, 40 to 50 ft. high, from Japan; 

 sometimes cultivated. Hardy at Boston. 



14. Plnus mltis, Michx. (COMMON YEL- 

 LOW 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. 



15. Plnus densiflora, Siebold. (JA- 

 PAN PINE.) Leaves about 4 in. long, 

 from short, fringed, scale-like sheaths ; 

 rigid, convex above, concave beneath 

 and somewhat serrulate on the mar- 

 gin, very smooth, sharp-pointed and 

 crowded, shining green and somewhat 

 glaucous ; falling when one to two years 

 old; 2 in a sheath. Cones abundant; 

 \y z in. long, short-peduncled, conical, \ 



obtuse, terminal, somewhat pendent; 

 scales linear-oblong, woody, with a P. densiflora. 



small prickle which soon falls off. A 

 beautiful small tree, 30 to 40 ft. high ; 

 from Japan ; hardy throughout. 



16. Pinus resindsa, 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. 



