Jepson Flora Project: Jepson Interchange for California Floristics    
Quercus ×grandidentata Ewan, nom. illeg.
FAGACEAE
Initial Editorial Analysis 15 Apr 2015
Source of Report for California  
a Munz, P.A. 1974. A Flora of Southern California. Univ. of California Press, Berkeley, as cited in Kartesz & Meacham
b Simpson, M. G., and J. P. Rebman, 1996. Checklist of the Vascular Plants of San Diego County. 3rd edition. SDSU Herbarium Press, San Diego, CA
Initial Editorial Comments listed in Munz as one of three names for hybrids between Quercus engelmannii and Quercus dumosa, in Munz Southern California Flora as only name for hybrids between these spp.; in no way mentioned in The Jepson Manual [Ed. 1]; indicated by Simpson & Rebman, 1996, as hybrid between Quercus engelmannii and Quercus berberidifolia
Correspondence and Comments Subsequent to Initial Analysis
Correspondence 1 Treatment and author notes submitted for The Jepson Manual [Ed. 2] by John M. Tucker see Comment 1
Editorial Comments 1 Correspondence 1 indicates that for The Jepson Manual [Ed. 2] Quercus X grandidentata Ewan is to be treated as a hybrid between Quercus durata var. gabrielensis and Quercus engelmannii, mentioned under the first parent but not treated otherwise.
Correspondence 2 15 Apr 2015 e-mail from Alan T. Whittemore see Comment 2
Editorial Comments 2 Correspondence 2 includes reference to a paper (I.M. Turner, Ann. Bot. Fennici 51: 308. 2014) in which Quercus X grandidentata Ewan (Bull. Torrey Bot. Club 64: 512. 1937) is shown to be a later homonym of the fossil Quercus grandidentata Unger (Gen. Sp. Pl. Foss. 401. 1850) and therefore illegitimate; it is replaced in this paper by Quercus ewanii I.M. Turner, which may be expressed as Quercus X ewanii I.M. Turner to indicate it is a hybrid. [Therefore, name changed to Quercus X grandidentata Ewan, nom. illeg., from Quercus X grandidentata Ewan, pro sp. previously in this Index, 15 April 2015.]
Editorial Summary and Current Status
Editorial Summary rejection, illegitimate, to be treated as syn
Current Status JFP-10b, taxonomic or nomenclatural synonym for taxonomically recognized and/or fertile hybrid; hybrid form of name
Current Name Quercus X ewanii I.M. Turner
Current Status Authority Jepson Flora Project
Current Status Date 15 Apr 2015
List of names for this Current Status category
List of ICPN names in Quercus
List of names from ICPN, Hrusa's Crosswalk, and Jepson Flora

Resources of the Jepson Flora Project: External links:
Distribution maps of Consortium specimens · County distribution
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