Report from the Oak ICRA checklist
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Full Name: - Quercus palustris 'Sovereign'

Quercus palustris 'Sovereign' McArdle & Santamour, Journ. Arboric., 13(10): 255 (1987) Cultivar name has been accepted as Registered
Infrageneric Classification
Subgenus Quercus, section Lobatae (the red oaks)
Nomenclature Note
US Patent granted to David B. Cole on 23rd August, 1966 without a designated name. Patent assigned to the Cole Nursery Company, Ohio, USA.
A photographic image of the patent documentation may be downloaded (for which you will need a TIFF reader on your computer).
Nomenclatural Standard
United States Plant Patent PP 2662
Main Horticultural References
(Jacobson) North American Landscape Trees, (1996) page 557
(Dirr) Manual of Woody Landscape Plants, 5th ed. (1998) page 827