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  Quercus flocculenta

C.H.Muller 1936 J. Arnold Arbor. 17: 172

Diagnosis here

Synonyms flocculenta f. incisa C.H.Mull.1936
flocculenta f. oblongifolia C.H.Mull. 1936
flocculenta var. typica A.Camus 1939, nom. inval.
Local names
Range Mexico (Nuevo Leon) ; 2300-2800 m;
Growth habit shrub or small tree..
Leaves 3-7 cm long, 1-2 cm wide; deciduous; sub-leathery; ovate-lanceolate or sometimes oblong; most often acute at apex, bristle-tipped; base rounded or broadly cuneate; margin plane, thick, entire near base, with 1-3 bristle-tipped teeth near apex; dark green, shiny above, almost glabrous (scattered stellate hairs along midvein and near base); underneath with easily removed, dense, greyish, stellate tomentum, masking a minutely papillose epidermis; 8-10 vein pairs, forked and anastomosing, unconspicuous above and prominent beneath; petiole 4-7 mm long, slender (0.5 mm thick), with persistent greyish tomentum.
Flowers male catkins 3 cm long, loose, slightly stellate pubescent; pistillate inflorescence 1-2 flowered on a 5-10 mm long peduncle, 1-2 mm thick, with stellate hairs;
Fruits acorn 1-2 cm long, ovoid, singly or paired, enclosed 1/3 in the cup; cup obconical with slightly pubescent scales, sometimes glabrous; maturing first year, from August to October;

Bark, twigs and

bark black, furrowed; slender twigs 1-2 mm thick, sulcate, whitish stellate pubescent at first, then glabrescent; very small bud (1.5-2 mm long), pointed, somewhat hairy; stipules pubescentes, persistent around terminal bud but soon hairless;
Hardiness zone, habitat hardy zone 7;
Miscellaneous -- A. Camus : n°372; 
-- Sub-genus Quercus, section Lobatae, Series Erythromexicanae, Group Saltillenses;
-- Threatened (IUCN Red List Category : EN)

Subspecies and
-- f. incisa : differs from the type in having deeply cut leaves with aristate lobes, margin revolute, crisped.

-- f. oblongifolia ; differs from the type in the oblong leaves 2-6 cm long, less pubescent abaxially.