Oaks of the World

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 Quercus parvula
AuthorGreene 1887
Synonymswislizenii f. parvula (Greene) Trel. 1924
Local names Sta Cruz Island oak; Coast oak;
Range Sta Cruz Island, and some places in Sta Barbara County;
Growth habit 1-3 m tall for the type species;
Leaves 3-16 cm, evergreen; oblong, lanceolate or ovate; hairless both sides; dull olive green above; dull grey green beneath; margins entire, seldom toothed; apex acute to acuminate; 6-8 vein pairs; petiole 2-10 mm;
Flowers 
Fruits acorn 3-4 cm long, ovoid, stalked, with tip abruptly tapered and shorter than Q.wislizeni; cup 1-1.5 cm in diameter, tomentose inside, with thin, flat scales; maturing second year;

Bark, twigs and
buds

thick grey brown branchlets;
Hardiness zone, habitat zone 8; occurs in wet areas of coastal fog belt;
Miscellaneous -- Section Lobatae;
--Usually described as closely related to Q.wislizeni, but genetic studies of plants from Central California show some distinctions with those of North of Mexico justifying their classification as true species (K.C. Nixon, 2002); Q. parvula differs from Q. wislizeni in having larger leaves (3-16 cm versus 2-5 cm), undersides dull olive green (vs shiny yellow-green), and acorn tip (abruptly tapered vs gradually tapered);
Subspecies and
varieties
2 varieties for this taxon :
1/ var. tamalpaisensis S.K. Langer 1993
taller tree than the type (to 17 m), larger leaves (5-16 cm x 2-6); 610 m in Tamalpais Mounts, California, at 610 m.

2/ var. shrevei (C.H.Muller) Nixon 1994
= Q.shrevei C.H.Muller 1938
taller than the type (reaches 17 m); California, from Sta Lucia Mts to the San Francisco Bay..
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