 | Arizona Walnut - Juglans major
Walnut Family: Juglandaceae |
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Arizona Walnut often has a forked trunk. |
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: 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, 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. Grows to 60 feet, trunk often forked with a wide spreading crown. |
Some trees in the genus Juglans, most notably the Black and Persian walnuts, produce a chemical, known as juglone, which can inhibit the growth of other plants. These chemicals are dissolved out of the leaves when it rains and are washed down to the ground below, reducing the growth of plants under the tree. The roots of many members of this genus produce substances that are toxic to many plant species, especially apples (Malus species), members of the Ericaceae, Potentilla spp and the white pines. |
Arizona Walnut grows to 60 feet. |
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