Juglans major

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Juglans major
Juglans major Morton.jpg
Juglans major
Morton Arboretum acc. 614-47*1
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Fagales
Family: Juglandaceae
Subfamily: Juglandoideae
Tribe: Juglandeae
Subtribe: Juglandinae
Genus: Juglans
Section: Rhysocaryon
Species: J. major
Binomial name
Juglans major
(Torr.) A. Heller
Juglans major range map 1.png
Natural range of Juglans major
  • Juglans elaeopyren Dode
  • Juglans microcarpa subsp. major (Torr.) A.E. Murray
  • Juglans microcarpa var. major (Torr.) L.D. Benson
  • Juglans rupestris var. major Torr

Juglans major (literally, the larger walnut), also known as Arizona walnut, is a walnut tree which grows to 50 ft tall (15 m) with a DBH of up to 2 feet (0.61 m) at elevations of 1000–7000 ft in Texas, Oklahoma, New Mexico, Arizona, and Utah.[3] It also occurs in Mexico as far south as Guerrero.[4] 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).


In moister areas, the tree features a single, stout trunk; there are usually several slender trunks in drier situations.[5] 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.[6][7]

Where the range of J. major overlaps that of J. microcarpa, the two interbreed, producing many intermediate forms.[8][9]


  1. ^ Tropicos
  2. ^ The Plant List
  3. ^ http://plants.usda.gov/java/profile?symbol=JUMA
  4. ^ Laferriere, J.E. 1993. Juglandaceae, Walnut Family. Journal of the Arizona-Nevada Academy of Science 27:219.
  5. ^ 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.
  6. ^ Heller, Amos Arthur. Muhlenbergia; a journal of botany 1(4): 50. 1904.
  7. ^ Torrey, John. Report of an Expedition down to the Zuni and Colorado Rivers 171, pl. 16. 1853.
  8. ^ Vines, Robert A. 1960. Trees, shrubs, and woody vines of the Southwest. Austin, TX: University of Texas Press. 1104 p
  9. ^ 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.

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