Pinaceae 29 
AA. Leaves 4-angled; branchlets and bud-scales tomentose; cones 3./——5 cm. long. 
C. E. L. lyallij Parl. (Woolly Larch) 
PINUS PINE 
Trees or shrubs. Leaves needle-like, all in sheathed bunches of 2——5 or rarely | 
(not ours) on knob-like branches. Staminate cones involucrate. Scales of pistillate 
cones thickened at tip, woody, tipped with a scar or protuberance. Seeds 2. (Latin 
name. ) ; 
A. 2 leaves in a bunch. 
Bae Leaves 2.57.5 cm- long: all in 2's: cones 1.52—5 cm. long, remaining on the 
trees for 530 years. W.C.E. (P. murrayana; P. contorta murrayana. ) 
P, contorta Dougl. (Lodge-Pole Pine) 
BB. Leaves 10—27 cm. long, often some in 3’s; cones 7.5—-37.5 cm, long; 
cone-scales dropping within 2 years. 
C. Cones 7.5—15 cm. long; seeds 6—7 mm. long; leaves persistent for 3 years. 
WCE. P. ponderosa Dougl. (Yellow Pine) 
CCS Cones: 12:5—37.5 cm. longs seeds 10—12 mm. long; leaves persistent for 
6—9 years. U.C. (P. jeffreyi.) 
P. ponderosa jeffreyi Vas. Jeffrey Pine) 
AA. 3 leaves in a bunch. 
D. Leaves in 2’s or 3’s; cones subterminal, falling within 2 years. (See C. or CC.) 
DD. Leaves all in 3’s; cones lateral, remaining 2—many years. C. 
P. attenuata Lem. (Knob-Cone Pine) 
AAA. _ 5 leaves in a bunch. 
E. Cones short-stalked (2—7 mm.), 3.7—12.5 cm. long Gin? P. flexilis-7:5— 
25 cm. long) ; cone-scales with prickles; thick; seeds longer than their wings (except 
in P. balfouriana) ; leaves 2.5—7.5 cm. long; bark whitish where smooth. 
F. Leaves 2.53.7 cm. long, persistent for 10—12 years; old bark divided 
. into isodiametric plates; cones 8.7 —12.5 cm. long, opening at maturity ; prickles 
of cone-scales on back and not at very tip, pointing away from cone-axis. U. 
P, balfouriana Murr. (Foxtail Pine) 
FF. Leaves 3.7—6.2 cm. long, persistent for 5—8 years; old bark divided into 
elongated plates; cones 3.7—7.5 cm. long, not opening at maturity; prickles on 
cone-scales at very tip, pointing toward cone-tip. C. 
P. albicaulis Engelm. (White-Bark Pine) 
FFF. Leaves 3.77.5 cm. long, persistent for 5—6 years; old bark divided 
into isodiametric plates; cones 7.5—25 cm. long, opening at maturity; prickles 
of cone-scales at very tip, pointing towards cone-tip. C. E 
P. flexilis Jas. (Limber Pine) 
EE. Cones long-stalked (1.2—7.5 cm.), 1.5—4.5 dm. long; cone-scales with 
obsolete prickles or none, thin; seeds shorter than their wings; leaves 3.7—-10 cm. 
long; bark green where smooth (or whitish in P. monticola). 
G. Cones 1.2—2.8 dm. long; seed 1/3 as long as its wing; old bark 3.7 cm. 
or less thick, broken into isodiametric plates; smooth younger bark whitish. W. 
Gare P. monticola Don. (Western White Pine) 
GG. Cones 3—4.5 dm. long; seed 14 as long as its wing; old bark 7.5 cm. or 
less thick, broken into elongated plates; smooth younger bark greenish. C. 
P, lambertiana Dougl. (Sugar Pine) 
