|Author||Greene 1887 Pittonia 1: 40 March|
|Synonyms||wislizenii 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; apex acute to acuminate; margins entire, seldom toothed; olive green, glabrous above; dull olive green, glabrous beneath; 6-8 vein pairs; petiole 2-10 mm;|
|Fruits||acorn 3-4.5 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
|thick grey brown branchlets;|
|Hardiness zone, habitat||zone 8; occurs in wet areas of coastal fog belt;|
|Miscellaneous||-- Sub-genus Quercus, section
Lobatae, Series Agrifoliae;
-- Usually described as closely related to Q.wislizeni (and considered by Nixon 1997 as a synonym), 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); moreover the habitats are different as well : Q. parvula is typical of wet costal areas, while Q. wislizeni is typical of arid slopes in the interior.
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.
For Keuter & Manos 2017, this taxon does not appear to be a variety, but rather suggest a hybrid origin via successive backcrosses between Q. parvula var. shrevei and Q. wislizeni.
2/ var. shrevei (C.H.Muller) Nixon 1994 Novon 4: 392
= Q.shrevei C.H.Muller 1938
taller than the type (reaches 17 m); California, from Sta Lucia Mts to the San Francisco Bay..