Arizona walnut Juglandaceae Juglans
major (Torr.) A. Heller
Leaf: Alternate, pinnately compound with 9 to 15 leaflets, 7 to 13 inches long, leaflets are narrowly ovate to lanceolate, somewhat curved, serrated margins, each 2 to 4 inches long, yellow-green above, paler below.
Flower: Species is monoecious; male flowers in yellow-green hanging catkins, 2 to 3 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 to 1 1/2 inches in diameter; husk is thin and indehiscent, initially bright green but turning brown; nut is grooved, maturing in fall.
Twig: Stout, initially green but turning brown, fuzzy; buds are scruffy light gray-brown; leaf scar are very large, raised and 3-lobed; pith chambered.
Bark: Gray-brown, furrowed with flat topped ridges.
Form: A small tree up to 50 feet in height, trunk often forked with a wide spreading crown.
Looks like: little walnut - California black walnut - Hind's black walnut