Oaks of the World

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  Quercus eduardi
Author Trel. 1922 Contr. U. S. Natl. Herb. 23: 189
Diagnosis here
Synonyms eduardi f. cespitifera Trel. 1924
nitidissima Trel. 1924 Diagnosis here
oligodonta Seemen ex Loes. 1900, illegitimate, not Saporta 1879
Local names encino manzano; manzanillo;
Range Mexico (Durango, Zacatecas, San Luis Potosi, Aguascalientes, Nayarit, Jalisco, Queretaro, Hidalgo, Veracruz); 1500-2700 m;
Growth habit 5-12 m or shrub 2-6 m tall;
Leaves 2-6 cm long, 1-3 wide; leathery, not rough; oblong or elliptic-oboval, sometimes oblong-lanceolate; apex aristate, acute or rounded, seldom obtuse; base cordate sometimes rounded; margins slightly revolute or flat, rarely entire or more often with 2-5 pairs of aristate teeth in the distal half; dark lustrous green above, glabrescent or with some stellate, sessile trichomes persistent near base; abaxial surface not so lustrous, paler, with dense whitish pubescence made of fasciculate, sessile, spiraly twirled hairs; 4-8 vein pairs, mostly straight, flat above; epidermis flat; petiole 4-8 mm, pinkish, minutely tomentose, glabrescent;
Flowers June-July; male catkins 2-3 cm, with densely hairy rachis bearing more than 20 flowers; 1 or 2 pubescent female flowers on 0.5-1 axis;
Fruits very small acorn, 8-10 mm long, sessile or nearly so (peduncle 2-5 mm long); paired or to 3; enclosed 1/2 by cup; cup halfround 1 cm in diameter, with thin and appressed scales; maturing in 1 year in August to November;

Bark, twigs and
buds

bark blackish, rough, broken into plates; twigs 1-3 mm in diameter, tomentose becoming slightly pubescent, dark red brown, with numerous, pale, unconspicuous lenticels; buds ovoid to elliptical, pointed, 2.5-4 mm; stipules 5-6 mm long, seldom persistent around terminal buds;
Hardiness zone, habitat hardy zone 7;
Miscellaneous -- Sub-genus Quercus, section Lobatae, Series Erythromexicanae;
-- Related to
Q.emoryi that has the apical lobe larger;
-- Differs from Q. durifolia which has the leaf margin entire, only fasciculate hairs abaxially, hairs with undulate rays.
-- Resembles Q. affinis but the lower side of the leaf of this species has some hairs only at the vein axils.
-- Q. eduardi has fasciculate contorted hairs abaxially, like Q. mexicana, but the latter has entire foliar margins, 7-12 vein pairs, a bullate and papillose epidermis..
-- Named after Edward Palmer, 1831-1911, who collected it near Durango in 1896; the latinization form of "Edward" being "Eduardus", the termination with a single "i" is correct.
Subspecies and
varieties
 
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