The Trees of Wyoming. 71 



KEY TO THE GENERA.* 



Leaves needle-shaped: 



fin small bundles of two to five I. Pine (Pinus}. 



ff Singly and with sharp points 2. Spruce (Ptcea). 



fff Singly and with blunt points 3. Douglas Spruce (Pseudotsuga}. 



5Leaves short, scale like 4. Juniper (Juniperns). 



^Leaves with a true blade and stem (petiole): 



f Fruit an egg shaped capsule, containing seeds furnished with a tuft 

 of white, silky hair: 



JBuds resinous 5. Cottonwood (Populus}. 



^Buds not resinous 6. Willow (Salix). 



ff Fruit a nut: 



JSmall, in a close, cylindrical or oval cluster: 



=Nutlet winged 7. Birch (Betula). 



= =Nutlet not winged 8. Alder (Alnus). 



\\ Large, with a cup, singly or in clusters of 2 to 3. 



-,. 9. Oak (Quercus). 



f ffFruit with conspicuous wings : 



^Produced in pairs 10. Maple (Acer}. 



^Produced singly 1 1. Ash (Fraxinus). 



ff ffFruit fleshy, drupe like (Stone fruits): 



JSeed single, large, flattened ) ( Plum ) 



ftSeed single, small, round f 1 Choke Cherry f (****k 



fffff Fruit fleshy, a pome: 



^Seeds large for the fruit, bony 13. Haw (Crataegus}. 



ffffffFruit fleshy, berry-like: 



JSeeds several, small 14. Serviceberry (Amelanchier). 



single, large, pulp dry. . . .15. Silver Berry (Eleagnus}. 



single, small, pulp juicy 



1 6. Buffalo Berry (Lepargyraea). 



*The small number of genera and species of trees represented, it should be noted, does not 

 indicate a scarcity of trees nor the absence of forests. It simply indie Ues that the climatic con- 

 ditions on these high plains and mountain ranges are unsuited to any but the hardier forms. 

 Scarcity of kinds does not mean scarcity of trees. One-sixth of the State or about 10,000,000 

 acres is more or less forest covered. Then too, what we lack in kinds of trees is more than made 

 up to us in the wealth of species of shrubs and herbaceous vegetation. 



-(12) 



