About Juglans major (Torr.) A.Heller
Arizona walnut, scientifically named Juglans major (Torr.) A.Heller, has different growth habits depending on moisture levels. In moister areas, it grows as a single, stout trunk, while it typically produces multiple slender trunks in drier locations. Its pinnately compound leaves are 20 to 36 centimeters (8 to 14 inches) long, and hold 9 to 15 lanceolate leaflets. Each leaflet measures 19 to 32 millimeters (0.75 to 1.25 inches) wide and 51 to 102 millimeters (2 to 4 inches) long. The tree produces a small nut that has a thick, deeply grooved shell, which surrounds an oily, edible seed. Juglans major grows primarily in canyons, riparian areas, near springs, and other locations that have shallow groundwater. When the range of Juglans major overlaps with that of Juglans microcarpa, the two species interbreed, producing many intermediate forms.
