Quercus × macdonaldii Greene

California (Santa Cruz, Santa Rosa and Santa Catalina Islands) at < 600 m;

2-15 m; compact, rounded crown;

4-7 cm long, deciduous or half-evergreen, thick, stiff; oblong to oboval, both ends rounded; margin with 2-6 shallow lobes, mainly pointed; adaxially green, lustrous, hairless or nearly so; pale green, tomentose beneath, with appressed stellate trichomes; petiole 0.3-1 cm;

acorn 2-3 cm, elongated, enclosed 1/3 in hairy cup; maturing in 1 year;

prefers sandy loam soils, not calcareous; withstands sea spray;

– Absent on american mainland; – Named after James Mac Donald who put up the money for the publication of “Illustration of West American Oaks” by Alb. Kellogg and Ed. Greene in 1889; – Different from Q.lobata by shallower leaves sinus, smaller and sharper lobes, smaller and more pointed acorns; – Fixed hybrid;