4 PINACEAE 
MORE narro owly conic when closed, and slightly um- 
bonate; seaies e m the appendage projecting 
far beyond the peer 5. P. heterophylla, 
Cone less. m 8 em 
Con roid or globular-ovoid, wen closed : leaves 15-25 
Sono. abou 6. P. serotina. 
(une narrowly cor conic c when ede leaves 4—12 em. long, 
uide readily opening, each with a slender or 
nute pipes towards the Mont of the appen- 
dage, the ne sometimes deciduous or oD- 
solet 
Cone-scales wi ith minute, deciduous or obsole 
spines: scales of the Par no aments pee 
toothed at the T : bark the trunk rela- 
T. P. glabra. 
vely close and s 
nc a with slender persistent spines : scales 
of a staminate ents T bark of the 
8. P. echinata. 
trunk broken into "angular pla 
Cone- scales tardily opening or a ay closed, 
each with a stout spine at the middle or towards 
the ba dc on the appendage. 
ae os the ovulate ament slender, each with a subulate tip 
veral times e length of the body. 
Gone. conic pres Closed. Ms when o open : Ds glaucous. 10. P. virginiana. 
9. P. clausa. 
pis 
Scales. of the vis stillate ament recurved: appendages of 
relatively thin; spines slender, more 
11. P.rigida. 
Scales of the Dis stillate ament ascending: appen ndages 
f the As ne-scales very thick; spines stout, more or 
less in 
. australis Michx. f. Tree becoming 40 m. tall, irregularly branched above, 
in 3’s, 90-40 em. long, bright-green, 
bout 
12. P. pungens. 
> 
be 
- 
T 
EN 
Ey 
P. 
see 
Os) 
esi 
“ss 
e 
RI 
» 
obi cipes 
9 
a 
(Fl. SE MAS 
STRAW PINE SE 
KAA 
MA 
SES 
we T 
aw ty 
Am ae 
e 
2 
m 
9 
-— 
Qu 
e 
99 
HB 
£u 
e 
UR 
Qu A 
EE 
Q 
o 
e 
99 
a) 
HJ 
famed 
e 
B 
B 
RES St 
E SENS 
EX 
and S — 
as the one with the lon 
largest cones. A timber. tree of the first im- 
tine in the U. S. 
portance, and the principal source of rosin and turpen 
2. P. car "aed Morelet. Tree usually smaller than P. australis: leaves in s. 
or 3’s, 18-30 cm. long (rar arely shorter), bright- green, on twigs about 5 mm 
diameter: a ament 2.5-4 em. long: ha ure ovulate ament Muir E 
—15 em. lo i i nic when closed, cylindric 
d 4-7 mm. long, 
m. lo or smaller.—(SLASH-PINE. CARIBBEAN-PINE. 
E.)— —Dr ry sandy or rocky soil, often calcareous, pen. Fla. and the low 
pce iu the coast to Miss. and Ga.—(W. I.)—The only pine growing 
ree on the oues Key 
3. P. palustris 
staminate ament 3.5-5 cm alf m ture Scio ament En. eon -1 
m. long, n ed ovoid ics tud. broadly ovoid open, each prs 
appendage very prominent: seed 6-8 mm. long, the wing 2-3 em. 
