Juglans hindsii
| Juglans hindsii | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fagales |
| Family: | Juglandaceae |
| Genus: | Juglans |
| Section: | Juglans sect. Rhysocaryon |
| Species: | J. hindsii |
| Binomial name | |
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Juglans hindsii (Jeps.) Jeps. ex R.E. Sm. |
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| Natural range of Juglans hindsii | |
Juglans hindsii, commonly called the Northern California walnut and Hinds' black walnut, is a species of walnut tree endemic to Northern California. It is commonly called claro walnut by the lumber industry and woodworkers, and is the subject of some confusion over its being the root stock for English walnut orchard stock.
The historical range of Juglans hindsii is from the San Joaquin Valley and Sacramento Valley to the Inner Northern California Coast Ranges and San Francisco Bay Area, in Northern California.
The tree grows in riparian woodlands, either in mono-species stands, or mixed with California oak species (Quercus spp.) and Fremont cottonwood (Populus fremontii) trees.
Juglans hindsii has only one confirmed native stand remaining. It is listed as Seriously Endangered on the California Native Plant Society Rare Plant Inventory. The IUCN classification is a Vulnerable species. It is threatened by hybridization with orchard trees, urbanization, and habitat conversion to agriculture.
Juglans hindsii is a medium-sized tree of short bulky proportions. It grows up to 30–60 feet (9.1–18.3 m) tall, has a single erect trunk, commonly without branches for 10–40 feet (3.0–12.2 m), and a crown that can be wider than the tree is tall. Trunks commonly reach 5–6 feet (1.5–1.8 m) in diameter near the base of the tree.
The leaf is approximately 1 foot (0.30 m) long, with 13-21 two to five per leaflet, with dentate margins. Unlike the Southern California walnut, the vein angles bear tufts of hair.
The nut has a smooth, brown, thick shell, that contains a small edible nutmeat.
Juglans hindsii has been commercially important as a for orchard stock of Juglans regia (English walnut) trees all over the world. It is also used as a parent to the fast-growing Luther Burbank hybrid, commonly called "Paradox" (Juglans hindsii x Juglans regia). "Paradox" rootstock is a hybrid, produced from a Northern California black walnut tree pollinated by an English walnut.
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Wikipedia