Flora of the Paloase Region 



12. PINUS. 



Evergreen trees with two kinds of leaves; the primary ones 

 scale-like with deciduous tips; the secondary ones forming 

 the ordinary foliage, needle-like, arising from the axils of the for- 

 mer in clusters of 25: ovule-bearing aments solitary or clustered, 

 each composed of numerous minute bracts, each with an ovule- 

 bearing scale in its axil; ament, upon maturing, becoming a cone; 

 the scales elongating and becoming woody: seeds two on the base of 

 each scale. 



Cone scales with prominent thickenings. 



Leaves two in a fascicle. . P. contorta. 



Leaves three in a fascicle. P. ponderosa. 



Cone scales without prominent thickenings: leaves five in a fascicle. 



P. MONTICOLA. 



P. contorta Dougl. Small tree, 10 to 20 m. tall, the dark bark usually 

 deeply checked: leaves 4-8 cm. long, dark green: cones small, ovoid, 4-5 cm. 

 long; scales thickened at the apex and armed with a stout point. 



Rare in the Thatuna Hills. A very variable species, by some authors 

 segregated into two or more. 



P. ponderosa Dougl. Large tree, 30-80 m. tall, 1-4 m. in diameter, the 

 reddish bark thick and deeply furrowed: leaves in fascicles of three, 15-25 

 cm. long, minutely serrulate: staminate aments cylindric, somewhat flex- 

 uous, 4-6 cm. long, crowded at the base of young shoots: pistillate aments 

 1-6, greenish or purplish, borne near the apex of the shoots of the season: 

 cones brown, ovoid, 7-10 cm. long, 5-6 cm. thick, frequently in clusters of 

 3 to 5; scales much thickened near the apex and bearing a stout sharp point. 

 Throughout our limits where the soil is gravelly. 



P. monticola Dougl. Tree 50-100 m. high, 1-2111. in diameter: bark gray, 

 rather smooth, longitudinally cracked: leaves pale green, in fascicles of 

 five, 4-7 cm. long: cones narrowly cylindrical, 15-30 cm. long, about 4 cm. 

 thick. Infrequent, Thatuna Hills. 



13. LARIX. 



Tall trees with horizontal or ascending branches and small nar- 

 rowly linear deciduous leaves, without sheaths, in clusters on 

 short lateral scaly bud-like brauchlets: aments short, lateral; 

 staminate from leafless buds; ovule-bearing buds commonly 

 leafy at the base and the aments red: mature cones ovoid or cylin- 

 drical, small, erect; scales thin, spirally arranged, obtuse, persis- 

 tent: ovules two on the base of each scale, ripening into two re- 

 flexed somewhat winged seeds. 



L. occidentalis Nutt. A large tree, 30-70 m. high, 1-2 m. in diameter: 

 bark thick, reddish, longitudinally fissured: branches short, horizontal, the 

 brauchlets glabrous; buds spherical: leaves narrowly linear, 2-4 cm. long, 

 in alternate fascicles of 12-18, deciduous: cones ovate-cylindric, reddish 



when young, brown when mature, 2-3 cm. long; scales broadly obi >ng, 

 truncate, ciliaU'-fringed when young: bracts scarious. dilated at tb 



