176 TREES OF THE NORTHERN UNITED STATES 
bright green color. Cones 1 to 1 in. long, 
eonical, ineurved, 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. Pinus mitis, 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 
Fv mitis, ft. high. Staten Island, south and west. 
The western form has more rigid leaves, 
and more spiny cones. 
15. Pinus 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; S 
144 in. long, short-peduncled, conical, 1 sy 
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 resin6ésa, 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. 
