Volume 13 Number .S 



The Plant World 



A Magazine of General Botany 

 AUGUST, 1910 



ROCKY MOUNTAIN RAMBLES 

 By L. H. Pammel. 



(Continued from July Number.) 



Two species of mountain mahogany occur, one the Cerco- 

 carpus parvifolius, smaller and more widely distributed in dry 

 situations, may be found growing with the Purshia tridentata 

 and the mountain maple {Acer glahrum). The larger species 

 (C. ledijolius) occurs only in the most exposed situations in 

 rocky soil. A small hard maple {Acer grandidentatum) occurs 

 along the mountain streams, common everywhere in Utah. The 

 dogwood {Cormis stolonifera) and the birch {Betula jontinalis) 

 are common in similar situations. The salmonberry {Rubus 

 Nutkanus) is common along brooks in Utah at an altitude of 

 6,000 feet, but northward, in the Bitter Root mountains, and in 

 Washington and Oregon occurs abundantly in the canyons and 

 moist situations at a much lower altitude. The box elder {Acer 

 Negundo), known as a common, ugly-looking tree along our 

 streams in Iowa, is a most beautiful one in Utah, especially when 

 cultivated, as it frequently is. It has a clean, straight trunk. 

 The Cottonwood {Populus angustijolia) is everywhere a common 

 tree along the streams of Utah. In the Uintah Mountains the 

 writer has seen it frequently at an altitude of 8,500 feet. West- 

 ward, the species is replaced by the black cottonwood {Populus 

 trichocarpa). This is true especially in the streams of Oregon 

 and Washington. It is a magnificent tree in the valleys of the 

 Columbia and Williamette. 



The quaking aspen {Populus tremuloides) is everywhere 

 common in the Rockies, the Uintah, and the Wasatch moun- 

 tains. It occurs everywhere with the lodge pole pine, but 



