Oaks of the World

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 Quercus wislizeni
AuthorA.DC 1864
Synonymsagrifolia Newb. not Née
wislizeni f. extima Jeps. 1909
Local namesInterior live oak ; Sierra live oak ;
Range California ; Mexico ; 300 - 1900 m ; introduced in Europe in 1874 ;
Growth habitusually a shrub, but may reach 20 m, with trunk to 1.5 cm in diameter; numerous branches; broad open crown;
Leaves 2.5-5 x 1.2-3 cm; evergreen; leathery; flat (i.e. not rolled under), elliptic or oval lanceolate; apex more or less pointed; base obtuse, or sometimes cordate; margin entire with small, awn-shaped teeth (to 16); dark lustrous green above; yellowish green beneath; petiole 3-20 mm long, hairless or weakly pubescent;
Flowersmale flowers in March-April, on 3-6 cm long catkins;
Fruits acorn 2-4 cm long, 0.8-1.4 cm wide; narrowly ovoid and gradually tapered at apex; hairless; sessile; both sides of cup slightly pubescent; cup enclosing 1/3 to 1/2 (sometimes 2/3) of nut, with flat, pointed scales free at their tip.

Bark, twigs and
buds

bark blackish, deeply fissured, with scaly ridges; twigs brown, hairless or slightly pubescent, stiff, 1.5-3 m in diameter; terminal bud reddish brown, ovoid, 3-9 mm long, hairless or with some hairs near apex;
Hardiness zone, habitat hardy; occurs on arid slopes; all types of soils; slow-growing;
Miscellaneous-- A. Camus : n° 298;
-- section Lobatae;
-- discovered by Adolf Wislizenius (1810-1889) = physician of St Louis, of German origin;
-- related to
Q.kelloggii and to Q.agrifolia (with which it forms hybrids)
-- resembles Q.parvula, but the latter has stalked acorns and dull upper surface of leaves; Q.parvula deserves a species rank;
Subspecies and
varieties

--- var. frutescens Engelm. 1876
= Q. wislizeni subsp frutescens (Engelm.) E.Murray 1983
shrub 2-4 m tall, multiple trunks, with smaller leaves (3.8 cm max.), oval, shiny green on both sides;
South California, Mexico (Baja Califofornia del norte);

--- Q.parvula Greene 1887 : see this word

--- Q.x moreha = kelloggii x wislizeni (= "Oracle Oak") : see this word

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