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Leaves: alternate, deciduous, pinnately compound; 9-13 leaflets, less than 36 cm long; leaflet ovate, asymmetrical, yellow-green, strong walnut odor
Flowers: male in long catkin
Fruit: globose nut less than 3.8 cm diameter; husk hairy, acrid (yellow tannin); nut, hard thick shell with small edible kernel
Bark: thick, deeply furrowed, gray-brown
Wood: hard, heavy, chocolate brown heartwood, chambered pith
Range: Southwest and northern Mexico, stream bottoms 1067-2135 m elevation
Importance: edible nuts (nogales), logs for cabinet-work, burls and stumps have especially desirable grain, fence posts, allelopathy
Best Recognized Features:
1. Thick shelled nut
2. Distinctive odor (leaves, husks)
3. Chambered pith