|Leaf: Alternate, pinnately compound with 15 to 19 leaflets, 8 to 13 inches long, leaflets are narrowly ovate to lanceolate and finely serrated margins, 2 to 4 1/2 inches long, shiny green above, paler below.
Flower: Species is monoecious; male flowers in yellow-green hanging catkins, 3 to 4 inches long from last year twigs; female flowers are very small and occur on short spikes either singly or in clusters of 2 or 3 near the ends of the current year twigs, appearing in spring with the leaves.
Fruit: Round nut, 1 1/2 to 2 inches in diameter; initially bright green but turning brown; nut is nearly smooth, maturing in fall.
Twig: Stout, initially green but turning reddish brown, buds are scruffy light brown; leaf scar very large, raised and 3-lobed; pith chambered.
Bark: Gray to brown, shallowly fissured, ridges flat topped and scaly.
Form: A medium sized tree ranging up to 60 feet tall, usually with a single, straight trunk and a spreading crown.
Looks like: California black walnut
- Arizona walnut
- English walnut