Oaks of the World

General data Classifications List of species Local names Back to
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  Quercus kelloggii
Author Newb. 1859 Pacif. Railr. Rep. Williamson, Bot. 6: 28, 89
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 2-3 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;

Bark, twigs and

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;
-- 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) ;

Subspecies and