Quercus durata


Fl. Calif. 1(2): 356. 1909.

Common names: Leather oak
Synonyms: Quercus dumosa var. bullata Engelmann Quercus dumosa var. revoluta Sargent
Treatment appears in FNA Volume 3.

Shrubs, evergreen, 1-2(-3) m. Bark scaly. Twigs gray or yellowish, 1-3 mm diam., densely or sparsely tomentulose, often with prominent, yellowish, spreading hairs. Buds brown or reddish brown, ovoid or globose, 1-2 mm, glabrous or puberulent. Leaves: petiole 1-5 mm. Leaf blade cupped or convex, rarely somewhat planar, (10-)15-40 × 7-15(-20) mm, base cuneate, rounded-attenuate, or truncate, margins entire or irregularly toothed, sometimes spinose, usually unevenly revolute, secondary veins 4-6 on each side, apex rounded or subacute; surfaces abaxially densely to sparsely covered with erect, stipitate, (1-)2-4(-6)-rayed hairs 1-4 mm, felty to touch, secondary veins prominent, adaxially grayish or yellowish, with dense or scattered, semi-erect or appressed hairs, secondary veins obscure or somewhat impressed. Acorns solitary or paired, subsessile; cup reddish, hemispheric, deeply cup-shaped or turbinate, 4-6 mm deep × 12-18 mm wide, enclosing to 1/2 nut or more, scales reddish or yellowish, weakly to strongly tuberculate, often somewhat glandular; nut globose, ovoid or cylindric, 15-25 × 10-25 mm, apex rounded or obtuse, persistently minute-puberulent. Cotyledons distinct.


Chaparral, oak woodlands, open pine forests, on serpentine and nonserpentine soils; 150-1500 m.

Varieties 2 (2 in the flora).

Selected References



1 Leaf blade adaxially grayish stellate, usually deeply cupped, growth compact; leaves densely crowded on twigs; serpentine soils, Santa Barbara County and northward. Quercus durata var. durata
1 Leaf blade adaxially greenish, glabrate or essentially so, rarely deeply cupped, usually moderately cupped or subplanar, growth open, scraggly; leaves not densely crowded; nonserpentine soils, Los Angeles County. Quercus durata var. gabrielensis