,,, PINACEAE. 



Tuniperus scopulorum Sargent. Rocky Mountain Juniper A shrub or 



tree W> m. high, much branched, the branches often drooping; 



foliar often glaucous; leaves small, acute each with a linear indist.net gland 



on ,!„■ back; berries blue-black with a thick whitish bloom, maturing the 



! year; seeds usually 2, grooved longitudinally. Spokane. 



16. THUJA. Arbor Vitae. 



i i-green trees or shrubs; leaves small or minute, scale-like, 

 ippressed, opposite, 4-ranked; flowers monoecious, both kinds 

 terminal, the staminate globose, the ovule-bearing ovoid or 

 oblong, small, their scales opposite, each bearing 2, rarely 2-5 

 eel ovules; cones ovoid or oblong, mostly spreading or re- 

 curved, their scales 6-10, coriaceous, opposite, dry, spreading 

 when mature. 



Thuja plicata Donn. Giant Cedar. Handsome pyramidal tree, 30-50 or 

 D BO m. high, 1-5 m. in diameter, the trunk rapidly tapering from the large 

 base; branches usually somewhat drooping; bark pale grayish, thin, fibrous, 

 longitudinally ti-sured; wood soft, the heart-wood reddish, odorous; leaves 

 oblong ovate, bright green, rapidly tapering to an acuminate cuspidate apex; 

 mutate aments minute, dark purple; pistillate aments usually crowded near 

 tin- tips of the branchlets; cones oblong, 1-1.5 cm. long, light colored, con- 

 ing of about 6 pairs of scales, these elliptical, mucronate on the back near 

 the apex. In moist places, Kamiack Butte, and the foothills of the Coeur 

 d'Aknes but absent from the Blue Mountains. 



17. PINUS. Pine. 



Evergreen trees with two kinds of leaves; the primary ones 

 ile-like with deciduous tips; the secondary ones forming the 

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

 in clusters of 2-5; ovule-bearing aments solitary or clustered, 

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

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

 the scales elongating and becoming woody; seeds two on the 

 base of each scale. 



ales without prominent thickenings; leaves five in a 

 •• le. P. monticola. 



ilea with prominent thickenings. 



two in a fascicle. p. murrayana. 



1 • avt - three in a fascicle. p. ponderosa. 



:;usmonticolal)ougl. Western White Pine. Tree 50-100 m. high, 1-2 m. 



Iiimrt. r; bark gray, rather smooth, longitudinally cracked; leaves pale 



, in last u les of five, 4-7 cm. long; cones narrowly cylindrical, 15-30 cm. 



ml I cm. thick. In the mountains at low altitudes. 



us murrayana Balf. Lodgepole Pine. Small tree, 10-20 m. tall, the 



ually deeply checked; leaves 4-8 cm. long, dark green; cones 



5 cm. long; scales thickened at the apex and armed with a 



In the mountains at low altitudes often forming dense pure 



nearly equal-sized trees. 



