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The Davey Tree Expert Company, also known as Davey Tree, is a North American employee-owned corporation. The company's main services are research driven tree services, grounds maintenance and environmental consulting services for residential, utility, commercial and environmental partners in the United States and Canada.
This was the first government-approved assisted long-distance migration program for a North American canopy tree. The western larch was selected for assisted species migration because of its significant commercial importance and the fear that climate change and parasites such as the mountain pine beetle would considerably diminish its supply. [102]
The Trees of North America. For the purposes of this category, "North America" is defined in accordance with the World Geographical Scheme for Recording Plant Distributions (WGSRPD), which calls it Northern America , namely as one of the nine "botanical continents".
Silvics of North America (1991), [2] [3] a forest inventory compiled and published by the United States Forest Service, includes many hardwood trees. [a] It superseded Silvics of Forest Trees of the United States (1965), which was the first extensive American tree inventory. [6]
Amelanchier (/ æ m ə ˈ l æ n ʃ ɪər / am-ə-LAN-sheer), [1] also known as shadbush, shadwood or shadblow, serviceberry or sarvisberry (or just sarvis), juneberry, saskatoon, sugarplum, wild-plum [2] or chuckley pear, [3] is a genus of about 20 species of deciduous-leaved shrubs and small trees in the rose family ().
The American elm is a deciduous tree which, under ideal conditions, can grow to heights of 21 to 35 meters (69 to 115 feet). [3] The trunk may have a diameter at breast height (dbh) of more than 1.2 m (4 ft), supporting a high, spreading umbrella-like canopy.