Juglans major (literally, the larger walnut), also known as Arizona walnut, is a walnut tree which grows to with a DBH of up to at elevations of in Texas, Oklahoma, New Mexico, Arizona, and Utah. 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 black walnut (as it belongs to the "black walnuts" section Juglans sect. Rhysocaryon), and the Spanish name (cimarron walnut).
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 (2008). National Wildlife Federation Field Guide to Trees of North America Inc, New York: Sterling Publishing Co., p. 228. The long pinnately compound leaves bear 9–15 lanceolate leaflets, wide by long. The small nut has a thick shell with deep grooves enclosing an oily, edible seed.Heller, Amos Arthur. (1909). Muhlenbergia; a Journal of Botany 1(4): 50.Torrey, John. (1853). Report of an Expedition down to the Zuni and Colorado Rivers 171, pl. 16.
J. major grows primarily in canyons or riparian areas, near springs, and other areas with shallow groundwater. 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 pPowell, 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.
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