PINACEAE. 3 



Leaves dull blue green; twigs 

 glaucous; cones 15-35 cm. 

 long. _ ^ 7. P.jeffreyi. 



Cones unsymmetrical, their outer 

 scales much enlarged toward 

 the base of the cone, remaining 

 closed and persistent on the 

 branches for many years. 8. P. attenuata. 



Cone scales prolonged into stout, 

 straight or incurved spur-like 

 spines; cones large and heavy. 

 Leaves gray green, drooping; 

 cones chocolate brown; seeds 

 longer than wings. 9. P. sahiniana. 



Leaves blue green, erect; cones 

 light brown; seeds shorter than 

 wings. 10. P. couUeri. 



Leaves in 2's; cones small, opening at 



maturity and deciduous. 11. P.murrayana. 



1. P. lambertiana Dougl. (Sugar Pine.) Becoming a large 

 tree, with light brown smoothish bark, splitting in small sections; 

 leaves 8-10 cm. long, with 5-6 lines of stomata on each of the 3 

 sides; staminate cones oval, 1 cm. long, with 10-15 involucral scales; 

 anthers denticulate-crested; fruiting cones cylindric, bright brown, 

 2-4 dm. long, 8-10 cm. broad, on peduncles 8 cm. long; seeds smooth, 

 black, 12 mm. long; wing scarcely twice as long, widest below the 

 middle, obtuse; cotyledons 13-15. 



Frequent in the San Gabriel and San Bernardino Mountains, 

 6000-8000 feet altitude. This species is the largest of all pines. 



2. P. flexills James. (Limber Pine.) A middle-sized tree with 

 furrowed gray bark; leaves 5, 3-6 cm, long, thick and rigid; staminate 

 cones oval, 12-14 mm. long, involucral bracts 8-9; anthers tipped 

 by a spur; fruiting cones oval to subcylindric, 8-16 cm. long, light 

 brown, scales rounded or pointed at the apex; seeds oval, com- 

 pressed, 8-12 mm. long; wing minute, scarcely exceeding 1 mm. in 

 width, usually remaining attached to the scale. 



Summits of San Gorgonio, San Jacinto and Santa Rosa Moun- 

 tains. 



3. P. quadrifolia Pari. (Parry Pine.) A small tree, 6-10 m. 

 high, with a round top; bark dark brown tinged with red, divided 

 by shallow fissures; leaves 3-5 (mostly 4) in a sheath, stout, glaucous, 

 30-45 mm. long; staminate cones oval, about 5 mm. long, surrounded 

 by 4 conspicuous bracts; fruiting cones subglobose, 3-5 cm. broad; 

 scales thickened at apex, rounded, conspicuously keeled, narrowed 

 with a central knob terminating in a truncate or concave umbo, 

 armed with a minute recurved mucro, bright chestnut brown, the 

 rest of the scale dull red; seeds oval, 10-16 mm. long; wings brown, 

 about 2 mm. wide, remaining attached to the scale. {P. parryana 

 Engelm.) 



Santa Rosa Mountains, southward on the desert slopes to north- 

 ern Lower California. 



