Oaks of the World

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  Quercus pacifica
Author Nixon & C.H.Muller 1994 Novon 4: 391
Synonyms dumosa var. polycarpa Greene 1889
Local names Channel Islands scrub oak ;
Range California (endemic at Sta Cruz, Sta Catalina and Sta Rosa Islands; does not occur on mainland); near sea level to 300 m;
Growth habit shrub, 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;
Flowers spring;
Fruits acorn 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

bark scaly; twigs minutely brown pubescent at first, becoming grey and glabrous; buds light brown, oval, 2-3 mm long;
Hardiness zone, habitat not quite hardy, but withstands -12° C; prefers dry places;
Miscellaneous -- Sub-genus Quercus, Section Quercus, Subsection Dumosae;
-- Rare. Threatened (IUCN Red List Category : EN).

-- 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