THE PLANTS OF MICHIGAN 



PINACEAE, the Pine Family 



Trees or shrubs, usually evergreen, with needle-like or scale-like 

 leaves; fruit a cone or berry. 



la. Leaves in clusters of 2 5 2. 



Ib. Leaves mostly in clusters of 10 or more, on short lateral wart- 

 like branches, deciduous each autumn 



Tamarack, Larix laricina. 

 Ic. Leaves not in clusters 4. 



2a. Leaves in clusters of 5 White Pine, Pinns strobus. 



2b. Leaves in clusters of 2 or 3 3. 



3a. Leaves 8 15 cm. long Norway Pine, Piniis resinosa. 



3b. Leaves 2 4 cm. long Jack Pine, Pinus banksiana. 



4a. Leaves alternate or scattered 5. 

 4b. Leaves opposite or whorled 8. 



5a. Leaves four-sided 6. 

 5b. Leaves flattened 7. 



6a. Leaves 6 12 mm. long .Black Spruce, Picea mariana. 



6b. Leaves 15 25 mm. long White Spruce, Picea canadensis. 



7a. Leaves short-stalked, 15 mm. long or less 



Hemlock, Tsuga canadensis. 

 7b. Leaves sessile, 15 30 mm. long Balsam, Abies balsamea. 



8a. Leafy twigs soft and flattened 



White Cedar, Thuja occidentalis. 



8b. Leafy twigs not distinctly flattened 9. 



9a. Leaves opposite 10. 



9b. Leaves in whorls of three 11. 



lOa. Erect shrub or tree Eed Cedar ; Juniperus yirginiana. 



lOb. Prostrate or spreading shrub 



Creeping Cedar, Juniperus horizontalis. 



lla. Erect shrub or small tree Juniper, Juniperus communis. 



lib. Spreading or ascending shrub, growing in dense mats 



Low Juniper, Juniperus communis var. depressa. 



