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2. Juglans californica - Wikipedia

   en.wikipedia.org/wiki/Juglans_californica

   Juglans californica, the California black walnut, also called the California walnut, or the Southern California black walnut, [1] is a large shrub or small tree (about 20–49 feet (6.1–14.9 m) [3]) of the walnut family, Juglandaceae, endemic to the Central Valley and the Coast Range valleys from Northern to Southern California.

3. Juglans nigra - Wikipedia

   en.wikipedia.org/wiki/Juglans_nigra

   Juglans nigra, the eastern American black walnut, is a species of deciduous tree in the walnut family, Juglandaceae, native to central and eastern North America, growing mostly in riparian zones. Black walnut is susceptible to thousand cankers disease , which provoked a decline of walnut trees in some regions.

4. Black walnut (disambiguation) - Wikipedia

   en.wikipedia.org/wiki/Black_Walnut_(disambiguation)

   Family Juglandaceae, genus Juglans sect. Rhysocaryon: Juglans nigra, the eastern black walnut, a species of flowering tree native to eastern North America. Juglans californica, California black walnut or Southern California black walnut. Juglans hindsii, the Northern California walnut or Hinds' black walnut. Juglans major, Arizona black walnut.

5. Walnuts in California - Wikipedia

   en.wikipedia.org/wiki/Walnuts_in_California

   He observed that the hybrid walnut trees were more vigorous that either parent trees. Burbank gave name Royal to hybrids between eastern American black walnuts (J. nigra) and northern California black walnuts (J. hindsii). He also named hybrids between north California black walnuts and English walnuts (J. regia) "Paradox". [7]

6. Juglans hindsii - Wikipedia

   en.wikipedia.org/wiki/Juglans_hindsii

   A specimen of Juglans hindsii from the Yosemite Museum Northern California Black Walnut in early June. Juglans hindsii is a large tree that grows up to 30–60 feet (9.1–18.3 m) tall in open settings, and may reach over 100 feet (30 m) tall in closed canopy settings. This species normally has a single erect trunk, commonly without branches in ...

7. Thousand cankers disease - Wikipedia

   en.wikipedia.org/wiki/Thousand_cankers_disease

   Conversely, Arizona walnut (Juglans major) appears to be quite resistant to the disease, with bark beetle attacks largely limited to small diameter branches, the fungus growing to a very limited extent, and effects of the disease rarely, if ever, progressing to involve large areas of the tree. Similarly southern California walnut (Juglans ...