Compare sources for Quercus wislizeni

California; Mexico; 300 - 1900 m; introduced in Europe in 1874;

usually a shrub, but may reach 20 m, with trunk to 1.5 cm in diameter; numerous branches; broad open crown;

Evergreen (leaves retained about two years). Shrub to medium tree often 30’. Usually short-trunked and broad spreading, crown varies from desne to open and airy. A multi-trunked shrub in S CA.

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 or with small, awn-shaped teeth (to 16); both sides hairless; dark lustrous green above; yellowish green beneath; petiole 3-20 mm long, hairless or weakly pubescent;

• 1 1/2”
• snooth edged or spiny
• underleaf shiny yellow-green

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.

• 1”
• usually stouter than agrifolia
• cup deep
• scales loose
• nearly size of leaves

male flowers in March-April, on 3-6 cm long catkins;

usually hairy

pointed

hardy; occurs on arid slopes; all types of soils; slow-growing;

• Common on dry slopes in foothill valleys often with other oaks, especially douglasii
• Uncommon in cultivation, only on West Coast
• Zones 8-9

– A. Camus : n° 298; – Sub-genus Quercus, section Lobatae, Series Agrifoliae; – Discovered by Adolf Wislizenus (1810-1889) = physician of St Louis, of German origin, botanist and friend of G. Engelmann; – 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;

Very similar to agrifolia and often found with it, but tends to have a narrower crown and smalle limbs, leaves thicker, leathery flat (never curled); leaves retained about 2 years, begin falling in 2nd summer/fall (vs leaves retained one year).

Extensive hybrid swarms with agrifolia and parvula in San Francisco Bay area where habitats meet.

Small leaved shrubby variants also exist; e.g., car fructens a shrub w/ leaves 1 - 1 1/2”.

Also hybridizes with kellogii, x morehus.