G.R. Hughes was active in northern California circa 1890s, Hughes painted Barbizon landscapes similar to that of Wm Keith. Probably one of his pupils.
Source: Edan Hughes, author of the book "Artists in California, 1786-1940"Nearly 20,000 biographies can be found in Artists in California 1786-1940 by Edan Hughes and is available for sale ($150). For a full book description and order information please click here