Quercus kelloggii Newb.

SW Oregon, California, Sierra Nevada ; to 2400 m; introduced in Europe in 1878;

reached 25 m, but is a 5 m tall shrub at high elevations; ascending branches; roundes crown, stout trunk;

7.5-20 x 5-13 cm; thick, leathery; apex pointed, base obtuse or cordate; margin deeply 7-11 lobed; toothed lobes (13-30 bristled teeth); lustrous green, hairless above; paler beneath with some stellate hairs at vein axils; veins raised on both sides; petiole 1-5 cm long, sometimes pubescent;

March to May; male flowers on 4-7.5 cm long catkins; female 1 to 6 together;

acorn 2-3 cm; elliptic; brown, puberulent near apex; very short stalk, or almost sessile; deep cup enclosing 1/2-2/3 of nut, with pale brown, flat, papery, over 4 mm long scales; maturing in 2 years; edible;

hardy; all types of soils, but prefers lime-free ones; thrive in well drained soils; slow-growing, long-lived; young plants have a low growth rate during 2-3 years;

– A.Camus :n° 430; – Sub-genus Quercus, section Lobatae, Series Agrifoliae (with agrifolia , parvula , wislizeni ) – Resembles Q.velutina ; – Hybridizes with Q.agrifolia ( = x ganderi ) and Q.wislizeni ( = x morehus ) ;