Oaks of the World

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  Quercus tomentella
Author Engelm. 1878 Trans. Acad. Sci. St. Louis 3: 393
Synonyms chrysolepis var. tomentella (Engelm.) E.Murray 1983
chrysolepis subsp tomentella (Engelm.) E.Murray 1983
tomentella var. conjungens Trel. 1924
Local names Island live oak ; Island oak ;
Range California Islands (Santa Rosa, Santa Cruz, Santa Catalina, Santa Clemente); Mexico (Guadalupe Island); 100 to 900 m;
Growth habit 6-12 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;

-- A.Camus : n° 294;
-- Sub-genus Quercus, section Protobalanus;
-- Discovered in Guadalupe Island in 1875;
-- Threatened (IUCN Red List Category : EN).
-- 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;