Oaks of the World

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 Quercus pacifica
AuthorNixon & C.H.Muller 1994
Synonymsdumosa var. polycarpa Greene 1889
Local namesChannel Islands scrub oak ;
RangeCalifornia (endemic at Sta Cruz, Sta Catalina and Sta Rosa Islands; does not occur on mainland); near sea level to 300 m;
Growth habitshrub, seldom a small tree, 2-5 m tall, sometimes more;
Leaves 1.5-4 x 0.7-2 cm; persistent or semi-persistent; oblong to oboval, slightly convex and wavy; margin entire or toothed (1-9 pairs of teeth); apex rounded, base broadly cuneate (young leaves tend to rounded base); shiny green above, bloomy beneath with appressed stellate hairs; 1-5 vein pairs; petiole 2-5 mm slightly pubescent;
Flowersspring;
Fruitsacorn 2-3 cm long, spindle-shaped, pointed, hairless; subsessile; enclosed 1/4 to 1/2 by cup; cup half-round or top-shaped, with irregular, warty scales; cotyledons distinct; maturing in 1 year;

Bark, twigs and
buds

bark scaly; twigs minutely brown pubescent at first, becoming grey and glabrous; buds light brown, oval, 2-3 mm long;
Hardiness zone, habitatnot quite hardy, but withstands -12° C; prefers dry places;
Miscellaneous-- Section Quercus;
-- rare, threatened species;
-- Has been at first considered as a variety of
Q.dumosa, then has been named Q.berberidifolia, but differs from the latter that has foliar base rounded, margins strongly toothed, smaller trichomes, acorn pointed, cup less warty; differs from the other "island scrub oak", Q.parvula, which has pointed, glabrous leaves, and stalked acorns;
-- It looks like an intermediate between Q.berberidifolia and
Q.douglasii ;
-- hybridizes with Q.lobata (= x
macdonaldii) ;
Subspecies and
varieties
 
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