Quercus × ganderi C.B.Wolf

California (San Diego); to 1500 m;

5 m

semi-persistent; thick; often convex; oboval; irregular and shallow lobes, with aristate sharp teeth; stellate tomentose beneath at first, becoming glabrescent with axil tufts;

acorn like the one of kelloggii , but slenderer at apex; maturing in 1 year, as in Q. agrifolia (2 years for Q. kelloggii );

acidic soils, without limestone; withstands drought;

– Sub-genus Quercus, Section Lobatae, Series Agrifoliae – rare; – In the past, Q. x ganderi was considered as the hybrid between Q. kelloggii and Q. agrifolia var. oxyadenia, while Q. x chasei was the hybrid between Q. kelloggii and Q. agrifolia ; but in 2017 Keuter & Manos found that : 1/ Q. x chasei appears to be actually Q. kelloggii X Q. parvula var . shrevei… 2/ there is no molecular evidence for Q. agrifolia var. oxyadenia to be placed at a varietal rank: their work did not show a monophyletic lineage for this taxon ; it is actually probably the result of a climatical adaptation of Q. agrifolia to a drier environment and a higher elevation.