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Taxon:  Juglans californica S. Watson



Summary
Genus:
Juglans
Section:
Rhysocaryon
Family:
Juglandaceae
Nomen number:
20728
Place of publication:
Proc. Amer. Acad. Arts 10:349. 1875
Comment:
valid publication verified from original literature
Verified:
11/03/2011 ARS Systematic Botanists.
Accessions:
0 (0  active, 0  available) in National Plant Germplasm System. 
Other conspecific taxa
Autonyms (not in current use), synonyms and invalid designations
Heterotypic Synonym(s)
Juglans californica S. Watson f. quercina (Babc.) Rehder
Juglans californica S. Watson var. quercina Babc.
No images
Reference(s)
  1. Aradhya, M. K. et al. 2007. Molecular phylogeny of Juglans (Juglandaceae): a biogeographic perspective. Tree Genet. Genomes 3:363-378. http://www.springerlink.com/content/112958/
  2. FNA Editorial Committee. Flora of North America. 1993- http://floranorthamerica.org/
  3. Hickman, J. C., ed. The Jepson manual: higher plants of California. 1993
  4. IPGRI. New World Fruits Database (on-line resource). http://www.bioversityinternational.org/databases/new_world_fruits_database/search.html
  5. Kartesz, J. T. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 1994
  6. Liberty Hyde Bailey Hortorium. Hortus third. 1976
  7. Little, E. L., Jr. Checklist of United States trees, Agric. Handb. 541. 1979
  8. Manning, W. E. 1960. The genus Juglans in South America and the West Indies. Brittonia 12:1-26. Note: mentions
  9. McGranahan, G. & C. Leslie. 2009. Breeding walnuts (Juglans regia). Breeding plantation tree crops: temperate species. 2009 249-273.
  10. Munz, P. A. & D. D. Keck. A California flora. 1959
  11. Potter, D. et al. 2002. Defining the sources of Paradox: DNA sequence markers for North American walnut (Juglans L.) species and hybrids. Sci. Hort. 94:157-170. Note: this study revealed the contribution of Juglans californica to the genetic makeup of a common hybrid that was assumed to be the exclusive result of a cross between J. hindsii × J. regia
  12. Rehder, A. Bibliography of cultivated trees and shrubs. 1949
  13. Stanford, A. M. et al. 2000. Phylogeny and biogeography of Juglans (Juglandaceae) based on matK and ITS sequence data. Amer. J. Bot. 87:872-882. http://www.amjbot.org
  14. Stone, D. E. et al. 2009. Natural history, distribution, phylogenetic relationships, and conservation of Central American black walnuts (Juglans sect. Rhysocaryon). J. Torrey Bot. Soc. 136:1-25.
Common names
English
California walnut –
southern California black walnut –
southern California walnut –
Distribution
order_codeStatusContinentSubcontinentCountryStateNote
1NativeNorthern AmericaSouthwestern U.S.A.United StatesCalifornias.w.
Native
Northern America
  • SOUTHWESTERN U.S.A.: United States [California (s.w.)]
Economic Uses


NGBT Plant Germplasm System Distribution Policy

Plant germplasm is distributed to scientists, educators, producers and other bona fide research and education entities from National genebank of Tunisia active collection sites. The NGBT Curator and/or Research Leader will, in accordance with current NPGS policies and procedures, determine the legitimacy of a request when necessary.

Distributions to fulfill requests for repatriation of subsamples of germplasm collections to a country or community of origin, especially following natural or man-made catastrophes, are considered a high priority.

Although distributions for research, education, and repatriation are of the highest priority, the NPGS also encourages various seed-saver organizations and public gardens to conduct germplasm conservation activities that engage many individuals and groups throughout the country. Elements of the NPGS cooperate with seed-saver organizations and public gardens and may store germplasm for and distribute germplasm to such organizations.

Distribution of germplasm from NPGS collections to fulfill requests from individuals seeking free germplasm strictly for home use is generally considered an inappropriate use of limited resources and conflicts with U.S. Government policy of not competing with commercial enterprises. Requestors can be asked, in an appropriate manner, to justify the use of specific NPGS germplasm instead of suitable commercially available germplasm.

Accessions listed in the Germplasm Resources Information Network (GRIN) database as “not available” due to insufficient or low viability seed and/or scheduled for regeneration will generally not be available for distribution.

Other accessions are listed in GRIN as “not available” because they are not a part of the NPGS collection per se, but are conserved in NPGS genebanks to meet specific needs as described later in the section entitled “Categories of Germplasm Distributed and Availability.” In this category are certain accessions of improved germplasm that are only available from the owner/developer. Other accessions require that specific conditions be met by the requestor before distribution is possible.

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