Oaks of the World

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  Quercus hirtifolia
Author M.L.Vasquez-Villagran, S. Valencia-A. & K.C.Nixon 2004 Brittonia 56(2): 137
Local names
Range Mexico : Southern part of the Sierra Madre Oriental (Hidalgo, Puebla, Veracruz), 1600 to 2400 m;
Growth habit Tree to 4-15 m, or shrub to 3-5 m;

2,8-12 x 1,6-7 cm; coriaceous or subcoriaceous; oboval to elliptic, rarely ovate; 1.5-2 times longer than wide ; apex aristate, pointed or apiculate, occasionally rounded; base cordate, sometimes rounded to oblique; margin sinuate, with 2-4 pairs of aristate teeth near apex and sometimes above base, seldom only aristate (without teeth); young leaves with some stellate trichomes adaxially; mature leaves slightly pubescent above, with some stellate trichomes along midvein; persistent pubescence underneath with scattered fascicled hairs (the 8-12 rays spreading away from the axis of the trichoma); the indumentum persistent or falling into plates by aging; abaxial epidermis usually smooth, somtimes papillose; 6-12 pairs of secondary veins, raised under; petiole 2.5-8 cm long, at first densely pubescent, becoming glabrescent with sessile non glandular stellate hairs;

Flowers in April-May; male catkins 2-8 mm long, with pubescent rachis; female flowers 1-3 together, with densely pubescent cupular scales, styles 1 mm long, and broadly spatulate stigmas;
Fruits acorn 0.7-1.9 cm long x 0.4-1.3 cm in diameter, on the tip of a thin, pubescent peduncle to 2.5 cm long; cup halfround with ovate, slightly pubescent scales, ciliate at margin; ripening first year from September to October;

Bark, twigs and

young twig 1.5-3.5 mm thick, pubescent, becoming glabrescent second year; terminal bud ovoid, 2-6 mm long x 1-2.5 mm in diameter, with ovate scales ciliate at margin; stipules deciduous;
Hardiness zone, habitat hardiness zone : 8;
Miscellaneous -- Sub-genus Quercus, section Lobatae, Series Erythromexicanae;
-- Closely related to
-- Threatened (IUCN Red List Category : EN).

-- Possible confusion with Q. laurina which is biennial, and has fasciculate stipitate trichomes in the axils of the secondary veins, and glandular trichomes on the abaxial surface;

Subspecies and