Juglans major explained

Juglans major (literally, the larger walnut), also known as Arizona walnut, is a walnut tree which grows to 50feet with a DBH of up to 2feet at elevations of NaNfeet in Texas, Oklahoma, New Mexico, Arizona, and Utah.^[1] It also occurs in Mexico as far south as Guerrero.^[2] Common names include Arizona black walnut (as it belongs to the "black walnuts" section Juglans sect. Rhysocaryon), and the Spanish name nogal cimarrón (cimarron walnut).

Description

In moister areas, the tree features a single, stout trunk; there are usually several slender trunks in drier situations.^[3] The 8–14 in long pinnately compound leaves bear 9–15 lanceolate leaflets, NaNinches wide by NaNinches long. The small nut has a thick shell with deep grooves enclosing an oily, edible seed.^{[4] [5]}

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.^{[6] [7]}

Notes and References

1. Web site: USDA Plants Database.
2. Laferriere, J.E. (1993). "Juglandaceae, Walnut Family". Journal of the Arizona-Nevada Academy of Science 27:219.
3. Kershner, Mathews, Nelson, and Spellenberg (2008). National Wildlife Federation Field Guide to Trees of North America Inc, New York: Sterling Publishing Co., p. 228.
4. Heller, Amos Arthur. (1909). Muhlenbergia; a Journal of Botany 1(4): 50.
5. Torrey, John. (1853). Report of an Expedition down to the Zuni and Colorado Rivers 171, pl. 16.
6. Vines, Robert A. (1960). Trees, shrubs, and woody vines of the Southwest. Austin, TX: University of Texas Press. 1104 p
7. 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.