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Juglans major
''Juglans major'' (literally, the larger walnut) is a walnut tree which grows to with a DBH of up to at elevations of 1000–7000 ft in Texas, Oklahoma, New Mexico, Arizona, and Utah.〔http://plants.usda.gov/java/profile?symbol=JUMA〕 It also occurs in Mexico as far south as Guerrero.〔Laferriere, J.E. 1993. Juglandaceae, Walnut Family. Journal of the Arizona-Nevada Academy of Science 27:219.〕 Common names include Arizona walnut, Arizona black walnut (as it belongs to the "black walnuts" section ''Juglans'' sect. ''Rhysocaryon''), and the generic Spanish term for walnuts ''nogal''.
==Description==
In moister areas, the tree features a single, stout trunk; there are usually several slender trunks in drier situations.〔Kershner, Mathews, Nelson, and Spellenberg, ''National Wildlife Federation Field Guide to Trees of North America'' Sterling Publishing Co., Inc, New York. © 2008 by Chanticleer Press, Inc. p. 228.〕 The 8–14 in long pinnately compound leaves bear 9–15 lanceolate leaflets, 3/8–11/4 in wide by 2–4 in long. The small nut has a thick shell with deep grooves enclosing an oily, edible seed.〔Heller, Amos Arthur. Muhlenbergia; a journal of botany 1(4): 50. 1904.〕〔Torrey, John. Report of an Expedition down to the Zuni and Colorado Rivers 171, pl. 16. 1853.〕
Where the range of ''J. major'' overlaps that of ''J. microcarpa'', the two interbreed, producing many intermediate forms.〔Vines, Robert A. 1960. Trees, shrubs, and woody vines of the Southwest. Austin, TX: University of Texas Press. 1104 p〕〔Powell, A. Michael. 1988. Trees & shrubs of Trans-Pecos Texas including Big Bend and Guadalupe Mountains National Parks. Big Bend National Park, TX: Big Bend Natural History Association. 536 p.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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