Flora of the Palouse Region 1 1 



P. engelmanni Parry. Handsome pyramidal tree, 30-40 m. tall, the bark 

 gray and scaly: branchlets pubescent: leaves dark-green, quadrangular in 

 cross section, very sharply pointed, 1.5-2 cm. long: cones cylindric-ovate, 

 3-6 cm. long, the scales ovate, truncate, rounded or retuse, crenulate. 

 Thatuna Hills, along streams; not common. 



17. THUYA. 



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

 appressed, opposite, four-ranked: aments monoecious, both kinds 

 terminal; thestaminate globose; the ovule-bearing ovoid or oblong, 

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

 ovules: cones ovoid or oblong, mostly spreading or recurved, their 

 scales 6-10, coriaceous, opposite, dry, spreading when mature. 



T. gigantea Nutt. 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, 1-1.5 cm. long, light colored, consisting of 

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

 apex. In moist places, Thatuna Hills and Kamiack Butte. 



Family 8. TAXACEAE. 



Dioecious trees or shrubs, not resin-bearing (in ours); leaves 

 evergreen or deciduous, linear (in ours): pollen-sacs and ovules 

 borne in separate clusters or solitary: fruit drupe-like (in ours). 



18. TAXUS. 



Evergreen trees or shrubs with spirally arranged, short-petioled 

 linear fiat leaves, spreading so as to appear two-ranked: aments 

 very small, axillary and solitary, sessile or nearly so: staminate 

 aments consisting of a few scal3 r bracts and 5 8 stamens: ovules 

 solitary, axillary, erect, subtended by a fleshy ring-shaped disk: 

 fruit consisting of the fleshy disk which becomes cup-shaped, 

 red and nearly encloses the bony seed. 



T. brevifolia Nutt. Small tree 4-10 m. high, sometimes much larger, the 

 bark loose and reddish; branches slender, horizontal or drooping: leaves hor- 

 izontal, 1-2 cm. long, linear, acuminate, cuspidate, with revolute margins, 

 shiny green above, glaucous beneath, abruptly narrowed at the base into a 

 short petiole: staminate aments globose, 3 mm. broad: fruit bright red, 

 insipid in taste; stone broadly ovate, acute, somewhat flattened, 3-4 mm. 

 long. Infrequent along streams, Thatuna Hills. 



Class 5. ANGIOSPERMAE. 



Ovules (macrosporangia) enclosed in a cavity (the ovary) formed 

 by the infolding and uniting of the margins of a modified rudi- 

 mentary leaf (carpel), or of several such leaves joined together, in 



