=D.= Scales of cones with short, rigid, straight spines; leaves 6 to 10 in. long 7. =D.= Scales with sharp, bent prickles. (=E.=) =E.= Leaves over 5 in. long, sometimes 15 in. long 8, 9. =E.= Leaves 3 to 5 in. long, rigid and flattened, from short sheaths, 10. * Leaves usually in twos; cones rarely over 3 in. long. (=F.=) =F.= Leaves over 3 in. long. (=G.=) =G.= Cone-scales with dull spines 11. =G.= With small or minute, persistent prickles 12, 13, 14. =G.= With no prickles, or small ones, early deciduous 15, 16. =F.= Leaves 3 in. or less long. (=H.=) =H.= Cone-scales with straight or slightly curved, rigid spines 17. =H.= Cone-scales with stout, recurved spines 18, 19. =H.= Cone-scales with small prickles which are early deciduous 20. =H.= Cone-scales without spines or prickles 21, 22. [Illustration: P. excélsa.] 1. =Pìnus excélsa=, Wallich. (BHOTAN PINE.) Leaves in fives, from short, fugacious, overlapping, membranaceous sheaths, 6 to 7 in. long, very slender, of a glaucous-green color, and very pendulous. Cones 6 to 9 in. long, and 2 in. in diameter, drooping and clustered, with broad, thick, wedge-shaped scales. A large beautiful tree from southern Asia, much subject to blight when planted in this country. Owing to its peculiar drooping branches it has been called the Weeping Fir. [Illustration: P. Lambertiàna.] 2. =Pìnus Lambertiàna=, Douglas. (LAMBERT'S or SUGAR PINE.) Leaves in fives, 3 to 4 in. long, from short, deciduous sheaths. Cones 12 to 18 in. long and 3 to 4 in. in diameter, gradually tapering to a point, on stalks 3 in. long, brown and pendulous when ripe, without resin; seeds large, oval, nearly 1 in. long, edible. A very large tree (100 to 300 ft. high in California and northward), and seemingly hardy and well worth cultivation in the East. Wood white and soft like that of the White Pine. [Illustration: P. Stróbus.] 3. =Pìnus Stróbus=, L. (WHITE PINE. WEYMOUTH PINE.) Leaves in fives, 3 to 4 in. long, from a loose, deciduous sheath; slender, soft, and whitish on the under side. Cones 4 to 6 in. long, cylindric, usually curved, with smooth, thin, unarmed scales. Tall (100 to 150 ft. high), very useful tree, of white, soft wood nearly free from resin and more extensively used for lumber than any other American tree. Has been common throughout, but is getting scarce on account of its consumption for lumber. [Illustration: P. montícola.]