2 Pinaceae 



1. PINUS L. PINE. 



Evergreen trees with 2 kinds of leaves, the primary 

 ones linear or scale-like, deciduous ; the secondary ones 

 forming the ordinary foliage, narrowly linear, arising 

 from the axils of the former in fascicles of 2-5, or soli- 

 tary in a single species ; subtended by the bud scales, 

 some of which are united to form a sheath. Staminate 

 cones borne at the bases of the shoots of the season, the 

 clusters of stamens spirally arranged each in the axil of 

 a minute scale ; filaments very short ; anthers 2-celled, 

 longitudinally dehiscent. Ovule-bearing cones solitary 

 or clustered, borne on the twigs of the preceding year, 

 composed of numerous imbricated minute bracts, each 

 with an ovule-bearing scale in its axil, ripening into a 

 large cone, which matures the following autumn, its 

 scales elongating and becoming woody. Seeds 2 on 

 the base of each scale, winged above, the testa crusta- 

 ceous. 



* Scales thin, with a terminal unarmed umbo; leaves in 5's. 



1. P. Lambertiana Dougl. (SUGAR PINE.) Becoming a large 

 tree, with light brown smoothish bark, splitting in small sec- 

 tions; 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 involu- 

 cral 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. 



2. P. flexilis James. 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- 



