THE ART OF THE SECOND GROWTH 



Sequoia sempervirens in the Coast Range is the biggest tree of the 

 zone, found at its edge. Pinus insignis, known as Mbntery Pine, 

 is valuable on sand dunes. 



Pinus tuberculata (attenuata) occurs most frequent! j" in even- 

 aged woods. Pinus sabiniana, Xut or Digger Pine, valuable for the 

 Indians, of Olive-like appearance, is mixed in the Oak parks and in 

 the Chaparal thickets. Another Nut Pine is Pinus parryana, grow- 

 ing 30 feet high. Pseudotsuga macrocarpa on St. Bernardino range. 

 Eucalyptus and Accacia from Australia, Oranges and Figs from 

 the Orient, were successfully introduced. 



II. Pacific forest of the moderately warm zone. 



This zone covers the major part of the forests of Oregon, 

 Washington and Northern California. It is characterized by an 

 even annual temperature and high precipitations. The winter bald 

 Oaks are represented in Oregon by Quercus garryana (White Oak), 

 in California by Quercus kellogii (Black Oak). Fraxinus Oregona, 

 Acer macrophyllum, Populus trichocarpa (the biggest Cottonwood 

 of the world) occupy the bottom land along the rivers; further 

 Sorbus, Amelanchier, Crataegus, Primus, Salix, Aesculus, Alnus, 

 Acer, Negundo, Platanus, Betula. All of these latter species unim- 

 portant commercially. 



In strict contrast with the Atlantic forest of the same zone, 

 the conifers rule in importance, foremost among them the Douglas 

 Fir (Pseudotsuga taxifolia) which stands temperatures of 15 

 degrees Faht. easily. Best development on west slope of Coast 

 Range. In the Rockies, it forms short boles, oAving to shorter 

 growing season and lack of atmospheric moisture. In Colorado, 

 Arizona and New Mexico occurs a gray variety. In the Sierras it 

 appears as a dependent species. On the Eraser river, a fourth race 

 of Douglas Fir is distinguished. 



Pinus ponderosa (Yellow Pine, Bull Pine). Height and timber 

 quality depend on proximity to Pacific Ocean. Optimum in Sierra 

 Nevada, where trees 300 feet high are frequently found. Very 

 heaA^y sap-wood. Name ponderosa imdeserved. No tree species 

 of the United States occupies a larger territory or shows greater 

 adaptability. 



Chamaecyparis lawsoniana (Port Orford Cedar) occupies a 

 small territory close to the Pacific Coast. It does not ascend the 

 mountains to altitudes over 1,500 feet. Heavy shade bearer, 

 splendid reproduction. 



Thuja plicata (Red Cedar of the West) up to 170 feet high. 

 Rare in California. Best development in Oregon and Washington 

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