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.

[5] 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).

The small nut has a thick shell with deep grooves enclosing an oily, edible seed.

Where the range of J. major overlaps that of J. microcarpa, the two interbreed, producing many intermediate forms.