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Waitt, Damon E.
Juglans major (Torr.) A. Heller
Synonym(s): Juglans elaeopyren, Juglans microcarpa var. major, Juglans rupestris var. major
USDA Symbol: juma
USDA Native Status: L48 (N)
Arizona walnut is a round-crowned deciduous tree to 48 ft. in height. With furrowed bark on the trunk, gray twigs, and reddish brown new growth covered with hairs visible under a 10x hand lens. Leaves up to foot long with 4 to 8 pairs of leaflets along a central axis and a single leaflet at the tip the margins finely toothed and the midrib of the lateral leaflet off-center, the wider part of the blade toward the leaf tip. Flowers inconspicuous, in elongate green clusters. Fruit spherical, 1 to 1 1/2 inches in diameter, intermediate in size between Black Walnut (Juglans nigra) and Little Walnut (Juglans microcarpa).
The small walnuts, known in Spanish as nogales, are gathered locally. The wood, like that of Black Walnut, is used for furniture and gunstocks, but the supply is limited. The valuable enlarged burls and bases of the trunks make beautifully patterned tabletops and veneer.
Bloom InformationBloom Color: Brown
Bloom Time: Apr , May
, UT Native Distribution:
to c. AZ
& mts. of Mex. Native Habitat:
Dry stream banks; canyons; 3500 to 7000 ft.
Growing ConditionsWater Use:
Medium Light Requirement:
Sun , Part Shade Soil Moisture:
Dry CaCO3 Tolerance:
Low Cold Tolerant:
Dry, rocky soils. Conditions Comments:
Arizona walnut is a round-crowned deciduous
tree. It often has a forked trunk and rounded crown of widely spreading branches, distinct walnut odor. Bark
is dark and deeply furrowed and ridged. Branched are wide-spreading. Leaves are pinnate. The thick-shelled, edible nut
is about 1 in. in diameter.
BenefitUse Wildlife: The nuts provide food for wildlife.
Interesting Foliage: yes
PropagationPropagation Material: Seeds
Description: Plant nuts in fall or spring. If nuts are sown in spring, they must be stratified.
Seed Collection: Collect nuts in fall or winter when husks begin to turn black and split open. Remove husks. It is not necessary to remove shell. Sow immediately or keep in moist sand over winter. Nuts lose viability if allowed to dry out.
Seed Treatment: Stratify for 60-120 days at 34-41 degrees.
Commercially Avail: yes
National Wetland Indicator Status
|Status:|| FAC || FAC || FACW |
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
From the National Suppliers Directory
According to the inventory provided by Associate Suppliers, this plant is available at the following locations:
Hill Country Natives
- Leander, TX
Record Last Modified: 2010-04-25
Research By: TWC Staff