Oaks of the World

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 Quercus berberidifolia
AuthorLiebm. 1854
Synonymsdumosa Nuttall 1842 in part
agrifolia var. berberidifolia (Liebm.) Wenz. 1884
dumosa f. berberidifolia (Liebm.)
Trel. 1924
dumosa var. munita Greene 1889
Local namesinland scrub oak ; California scrub oak
RangeCalifornia, Mexico; from 100 to 1800 m ;
Growth habit1-4 m, sometimes shrubby, with several trunks; more erect and straighter than Q.dumosa;
Leaves 1.5-3 x 1-2 cm; evergreen; elliptic to oboval; base truncate or remotely rounded; apex somewhat pointed; margins toothed, spiny (2-7 pairs of teeth); lustrous green and glabrous above; glaucous, bloomy, weakly pubescent beneath with few short, 6-8 rays stellate trichomes; petiole hairy, 2-4 mm long;
Flowers 
Fruitsacorn 1.5-3 cm; solitary or paired; barrel-shaped, brown; cupule glabrous inside, subsessile, with rusty knobbed scales, covering 1/4 of nut; maturing in 1 year;

Bark, twigs and
buds

bark grey, scaly; branchlets grey or rusty, stiff; buds brown, globose, minutely pubescent, 2-3 mm long;
Hardiness zone, habitathardy zone 7; inhabits dry sites;
Miscellaneous-- A. Camus : n° 176;
-- "white oaks" group (= section Quercus);
-- introgression with Q.dumosa, the "coastal scrub oak", or "Nuttall's scrub oak";
-- today's taxonomists actually distinguish 2 different species : Q.dumosa in coastal ranges, and Q.berberidifolia going inland; moreover, plants native to Santa Catalina Island and other neighbouring islands, first considered as varieties of Q.dumosa, later identified to Q.berberidifolia, are currently named Q.pacifica.
-- different from Q.dumosa and from Q.durata var. gabrielensis (both have abundant hairs on the leaves undersides), from Q.cornelius-mulleri (still more pubescent beneath), from Q.john-tuckeri (glaucous leaves and larger acorns), and from Q.turbinella (glaucous leaves and stalked acorns);
-- hybridizes with many other Californian white oaks : see Q.x acutidens
Subspecies and
varieties
 
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