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Juglans nigra, the eastern American black walnut, is a species of deciduous tree in the walnut family, Juglandaceae, native to central and eastern North America, growing mostly in riparian zones. Black walnut is susceptible to thousand cankers disease , which provoked a decline of walnut trees in some regions.
The original tree is converted to a binary tree: each node with more than two children is replaced by a sub-tree in which each node has exactly two children. Each region representing a node (starting from the root) is divided to two, using a line that keeps the angles between edges as large as possible.
United States map of the Black American population from 1900 U.S. Census There were few alternative jobs in the Black Belt region. When factories opened or retooled to supply the war effort in World War II, and the military draft was introduced, large numbers of African American farmers left for the army or cash-paying jobs in nearby or distant ...
Juglans major (literally, the larger walnut), also known as Arizona walnut, [1] is a walnut tree which grows to 50 ft tall (15 m) with a DBH of up to 0.61 metres (2 ft) at elevations of 300–2,130 m (1,000–7,000 ft) in Texas, Oklahoma, New Mexico, Arizona, and Utah. [4] It also occurs in Mexico as far south as Guerrero. [5]
Black Hills spruce: Picea glauca var. densata: 1947 [52] Tennessee: Tulip-tree: Liriodendron tulipifera: 1947 [53] Texas: Pecan: Carya illinoinensis: 1919 [54] United States Virgin Islands: None [55] Utah: Quaking aspen: Populus tremuloides: 2014 [56] Vermont: Sugar maple: Acer saccharum: 1949 [57] [58] Virginia: Flowering dogwood: Cornus ...
Betula nigra, the black birch, river birch or water birch, is a species of birch native to the Eastern United States from New Hampshire west to southern Minnesota, and south to northern Florida and west to Texas. It is one of the few heat-tolerant birches in a family of mostly cold-weather trees which do not thrive in USDA Zone 6 and up.
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.
Avicennia germinans, the black mangrove, [3] is a shrub or small tree growing up to 12 meters (39 feet) in the acanthus family, Acanthaceae.It grows in tropical and subtropical regions of the Americas, on both the Atlantic and Pacific Coasts, and on the Atlantic Coast of tropical Africa, where it thrives on the sandy and muddy shores where seawater reaches.