General Key to the Families 



monoecious, axillary, solitary ; fruit a bony-coated seed, or rarely a 

 cone. 



I. TAXUS. (Tourn.) L. 



i. T. brevi folia. Nutt. Western Yew. 



VII. PINACE^. PINE FAMILY 



Trees or shrubs, mostly evergreen; leaves needle-shaped, entire; 

 flowers monoecious or rarely dioecious, borne in the form of scaly 

 catkins of which the fertile ones become berry-like or cones; juice 

 resinous. 



I. PINUS. (Tourn.) L. 



1. P. albicaulis. Engelm. White-bark Pine. 



2. P. monticola. Dougl. Mountain Pine. 



3. P. ponderosa. Dougl. Bull Pine. 



4. P. contorta var. Murray ana. Engelm. Lodge Pole 



Pine. 

 II. LARIX. (Tourn.) Adans. 



i. Lyallii. Parl. Ly all's Larch. 



III. PICEA. Link. 



1. P. canadensis. (Mill.) BSP. White Spruce. 



2. P. Engelmanni. Parry. Engelmann's Spruce. 



IV. ABIES. (Tourn.) Hill. 



i. A. lasiocarpa. (Hook.) Nutt. Balsam Fir. 

 V. TSUGA. (Endl.) Carr. 



1. T. heterophylla. (Raf.) Sarg. Western Hemlock. 



2. T. Mertensiana. (Bong.) Carr. Mountain Hemlock. 

 yi. PSEUDOTSUGA. Carr. 



i. P. taxifolia. Britton. Douglas Fir. 

 VII. THUYA. L. 



i. T. plicata. Donn. Red Cedar. 

 VIII. JUNIPERUS. (Tourn.) L. 



1. J. scopulorum. Sarg. Rocky Mountain Juniper. 



2. J. horizontalis. Moench. Creeping Juniper. 



3. J. communis var. montana. Ait. Alpine Juniper. 



