Oaks of the World

General data Classifications List of species Local names Back to
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  Quercus kelloggii
Author Newb. 1859
Synonyms californica (Torr.) Cooper 1858
sonomensis Benth. ex A.DC 1864
tinctoria W. Bartram var. californica Torr. 1857
Local names California black oak 
Range SW Oregon, California, Sierra Nevada ; to 2400 m; introduced in Europe in 1878;
Growth habit reached 25 m, but is a 5 m tall shrub at high elevations; ascending branches; roundes crown, stout trunk;
Leaves 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;
Flowers March to May; male flowers on 4-7.5 cm long catkins; female 1 to 6 together;
Fruits acorn 2.5-4 cm; elliptic; brown, puberulent near apex; 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;

Bark, twigs and
buds

bark at first grey brown and smooth, becoming dark, rough, furrowed; twigs brown, glabrescent, 2-3.5 cm in diameter; terminal bud brown, ovoid, glabrous or with ciliate margin scales, 4-10 mm long;
Hardiness zone, habitat 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;
Miscellaneous -- A.Camus :n° 430;
-- section Lobatae;
-- resembles
Q.velutina ;
-- hybridizes with
Q.agrifolia ( = x ganderi) and Q.wislizeni ( = x moreha) ;
Subspecies and
varieties

Pictures