California black walnut Juglandaceae Juglans
californica S. Watson
|Leaf: Alternate, pinnately compound with 9 to 15 leaflets, 7 to 12 inches long, leaflets are narrowly ovate to lanceolate and finely serrated margins, 1 to 3 inches long, shiny green above and 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, initially bright green but turning brown; nut is shallowly grooved, 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 small to medium sized tree ranging from 20 to 40 feet tall, most trees fork into several trunks near the ground and have an over all v-shape.
Looks like: Hind's black walnut
- Arizona walnut
- English walnut
| Additional Range Information:
Juglans californica is native to North America.
Range may be expanded by planting.
See states reporting California black walnut.
| External Links:
USDA Plants Database
|© Copyright 2016, Virginia Tech|
Dept. of Forest Resources
and Environmental Conservation,
all rights reserved.
Photos and text by: John Seiler,
Edward Jensen, Alex Niemiera,
and John Peterson