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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. |
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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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