PlNACEAE 7 



2. Not weeping. 3. 



Weeping. T. canadensis pendula. 



3. Conical or oblong. 4. 



Round-topped. T. canadensis globosa. 



4. Green. T. canadensis. 

 Whitish on the young growth. T. candensis albo-spica. 



PSEUDOTSTJGA. Douglas Fir. 



Percurrent evergreen, often of very large size, with rather 

 soft often reddish ductless wood with transversely clustered 

 resin passages; moderate fluted glabrate twigs; .small homo- 

 geneous pith; 5-ranked round slightly raised leaf-scars with a 

 single bundle-trace; no stipule-scars; ovoid scaly dry buds; 

 flat linear entire leaves, white-lined beneath; monoecious cat- 

 kin-like or cone-like naked flowers; and moderate-sized spread- 

 ing cones with persistent thin scales, each covering 2 winged 

 seeds. 



Cones with long-protruding bract-points. P. mucronata. 



ABIES. Fir. 



Percurrent spire-like evergreen trees with flaking bark in 

 age, sometimes resinous-blistered; pale soft ductless wood ex- 

 ceptionally with a few resin passages; slender terete twigs; 

 small pale homogeneous pith; elliptical unraised leaf-scars 

 with a single bundle-trace; no stipule-scars; ovoid scaly resi- 

 nous 1 buds largely clustered near the end; small alternate 

 oblong mostly blunt or notched flat entire leaves white and 

 stomatiferous beneath, with 2 resin-passages; monoecious 

 catkin-like or cone-like naked flowers; and erect cones with 2 

 winged seeds under each of the deciduous scales. 



1. Leaves flat or grooved, green above, whitened beneath. 2. 

 Leaves blue or glaucous, often 4-sided. 6. 



2. Leaves mostly blunt or notched. 3. 



Leaves typically pointed: twigs pubescent. A. Veitchii. 



3. Cones green or purple. 4. 

 Cones orange-brown. 5. 



4. Cones 10 cm.: bracts shorter than scales. A. balsamea. 

 Cones nearly 15 cm. long: bracts longer than scales. A. Picea. 



