3, 4.

=C.= Scales of cones thick and woody, obtuse, 1 in. broad 5.

=B.= Cones under 4 in. long; scales slightly hooked but
pointless 6.

* Leaves usually in threes, rarely in twos; scales of cones with
spines or prickles. (=D.=)

=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. excelsa.]

1. =Pinus excelsa=, 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. Lambertiana.]

2. =Pinus Lambertiana=, 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 th