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United States Department of Agriculture

Agricultural Research Service

Title: Juglandaceae

Author
item Whittemore, Alan

Submitted to: Jepson Manual of the Higher Plants of California, Ed. 2.
Publication Type: Book / Chapter
Publication Acceptance Date: June 28, 2009
Publication Date: January 31, 2012
Citation: Whittemore, A.T. 2012. JUGLANDACEAE. Jepson Manual of the Higher Plants of California, Ed. 2. pp.832-833.

Interpretive Summary: This contribution will form a section of The Jepson Manual of the higher plants of California, a manual published by the University of California to provide up-to date information on the taxonomy, distribution, and ecological status of all plants that are wild or invasive in California, together with a guide for identification, aimed at professional and sophisticated amateur users. The taxonomy, distribution, and ecological status of all species of Juglandaceae that are wild or subject to escape in California is reevaluated, based primarily on a thorough reexamination of available herbarium specimens, and a guide for identification is supplied. Three species in the single genus Juglans are included. These are important as a commercial food crop (walnut) and as ornamentals, and one species is of conservation concern. This contribution provides up-to-date information on the biology of this group of species, along with identification aids. It will support accurate identification of species of conservation concern, and species with value as rootstocks for commercial walnut production. It will be used by professional land managers, educators, conservationists, and sophisticated amateur botanists and horticulturalists, insuring that work on land management and conservation will be based on full, accurate and up-to-date information about the basic biology and relationships of these organisms.

Technical Abstract: The family Juglandaceae is treated for The Jepson Manual of the higher plants of California, a detailed floristic manual for the state published by the University of California. One genus and three species are recognized; full morphological descriptions, dichotomous keys, and brief summaries of geographical and ecological distribution, economic use, and taxonomic notes are given for each of them. These species are important as a commercial food crop (walnut) and as ornamentals, and one species is of conservation concern. This contribution will support accurate identification of species of conservation concern, and native species with demonstrated value as rootstocks for commercial walnut production.

Last Modified: 9/23/2014
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