Oaks of the World

General dataClassificationsList of speciesLocal namesBack to
home page

 Quercus tomentella
AuthorEngelm. 1877
Synonymschrysolepis var. tomentella (Engelm.) E.Murray 1983
chrysolepis subsp tomentella (Engelm.) E.Murray 1983
tomentella var. conjungens Trel. 1924
Local namesIsland live oak ; Island oak ;
Range California Islands (Santa Rosa, Santa Cruz, Santa Catalina, Santa Clemente); Mexico (Guadalupe Island); 100 to 900 m;
Growth habit6-12 m tall usually, but may reach 20 m, with trunk to 0.4-0.6 m in diameter; crown rounded with spreading branches;
Leaves 5-10 x 2.5-5 cm; evergreen; stiff; leathery; elliptic or ovate, sometimes slightly oblong; apex pointed to attenuate; base obtuse to rounded, cordate or not; margin slightly thickened, strongly revolute, cartilaginous, entire, or crenate-dentate with 3-7 pairs of teeth; glossy dark green or yellowish green above, hairless or with some scattered stalkless trichomes, mainly at base of midvein; greyish, densely tomentose beneath, with scattered, sessile stellate hairs and simple ones along midvein; 8-12 conspicuous, parallel vein pairs, impressed adaxially, raised beneath; petiole 3-10 mm long, thick, flattened above, with rusty hairs;
Flowers in April-May; staminate flowers pubescent, on 5-8 cm long catkins; female inflorescences few-flowered;
Fruits acorn 2.5-3 cm long; solitary or paired; apex rounded; cup sessile or with a 0.8-1.3 cm long peduncle, hairy inside and outside, with warty scales, enclosing 1/3 to 1/2 of nut; maturing in 2 years from August to October;

Bark, twigs and

bark reddish brown, thin, scaly, turning greyish, ridged; twigs hairy, red brown, stiff; terminal bud conical, 7-10 mm long, with ciliate scales; stipules with long pubescence, in a spiral, deciduous;
Hardiness zone, habitat not quite hardy (zone 8); all types of soils;
Miscellaneous-- A.Camus : n° 294;
-- "golden oak" (= Sub-genus Quercus, section Protobalanus);
-- discovered in Guadalupe Island in 1875; rare;
-- resembles Q. agrifolia (which has convex leaves, secondary veins not so conspicuous), and Q. parvula (which has stalked acorns);
Subspecies and
-- Hybrids with Q. chrysolepis, hardy;