18 PINACEAE. 



Prostrate shrub; leaves uniformly awl-like. /. sibirica. 



Erect shrub or tree; leaves of two forms, some scale-like, 



others awl-like. /. scopulorum. 



Juniperus sibirica Burgsd. Mountain Juniper. A prostrate shrub; 

 leaves linear-subulate, sharp-pointed, glaucous on the upper side, arranged in 

 whorls of three; fruit dark blue, as large as a pea. 



Common in the mountains at 900-1000 m. elevation. Many botanists 

 consider this a subspecies of J. communis L. under the name of /. communis 

 montana Ait. 



Juniperus scopulorum Sarg. Rocky Mountain Juniper. A shrub or 

 scraggly tree, 1-6 m. high, much branched, the branches often drooping; 

 foliage often glaucous; leaves small, acute, each with a linear indistinct gland 

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

 second year; seeds usually 2, grooved longitudinally. 



On the islands and mainland about the Gulf of Georgia and the northern 

 part of Puget Sound. Not elsewhere known west of the Cascade Mountains 

 but common from these mountains eastward to the Black Hills. 



25. CHAMAECYPARIS. 



Evergreen trees with flattened 2-ranked branchlets and small 

 scale-like leaves; aments terminal; staminate small, globose, 

 with shield-shaped filaments; pistillate erect, with 6-10 very 

 thick scales in pairs; cones small, globose, maturing the first 

 year; seeds few, at the base of each scale, angled or more or less 

 winged. 



Chamaecyparis nootkatensis (Lamb.) Spach. Alaska Cedar, Medium 

 sized tree, 20-30 m. tall, 30-100 cm. in diameter; bark thin, pale gray; leaves 

 small, sharply acute; cones globose, 8 mm. in diameter. 



Common in the mountains at 1200-1800 m. elevation. Alaska Cedar 

 ranges from Prince William Sound, Alaska, to Mount Hood, Oregon. It is 

 not known to occur east of the Cascade Mountains. The tree first became 

 known to botanists from specimens collected at Nootka Sound. 



26. THUJA. ARBOR VITAE. 



Evergreen trees or shrubs; leaves small or minute, scale-like, 

 appressed, 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 3-5 

 erect ovules; cones ovoid or oblong, mostly spreading or recurved, 

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

 mature. 



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

 even 80 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 fissured; wood soft, the heart- wood reddish, odorous; leaves 

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

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

 the tips of the branchlets; cones oblong, 11.5 cm. long, light colored, con- 

 sisting of about 6 pairs of scales, these elliptical, mucronate on the back m-ar 

 the apex. 



