Quercus glaucoides Mart. & Gal.

Center and South-West Mexico ( Guerrero, Guanajuato, Hidalgo, Jalisco, Michoacan, Oaxaca, Querretaro, Mexico, Morelos, Nayarit, Puebla, Zacatecas); 1000-3000 m;

3-8 m tall, trunk 25-40 cm wide;

8-12 x 4-7 cm, 2 times as long as wide ; semipersistent; coriaceous; oblong to oblanceolate; apex rounded, sometimes emarginate; base rounded sometimes cordate slightly oblique; margin cartilaginous, not revolute, usually undulate, entire or with 1-7 pairs of obtuse, broad, mucronate teeth often turned to the foliar apex; blue green, dull, glabrous above or with at base a sparse pubescence made of stellate trichomes; yellowish green beneath, glabrous or seldom with scattered stellate trichomes and glandular ones; 6-12 yellowish vein pairs, prominent on both sides, more abaxially than adaxially; pruinose, glaucous, papillose epidermis; petiole 2-6 mm, often dark reddish, glabrescent, pruinose;

in April-May; male catkins 2-3 cm long, bearing numerous flowers with pilose anthers; pistillate ones to 10 cm long, bearing 2-8, scattered, pubescent flowers ;

acorn 1-1.8 cm, ovoid, brown; paired or to 3; subsessile or more often on a 1-6 cm long, glabrous peduncle; enclosed 1/3 or more by cup; cup turbinate or halfround with tomentose, tuberculate scales; cotyledons fused; maturing in 1 year from July to November;

not quite hardy; prefers calcareous, dry sites;

– A. Camus : n° 201; – Sub-genus Quercus, Section Quercus, Subsection Leucomexicanae, Group Glaucoideae; – No hybrids known yet; – Not to be confused with Q.glaucoides ( Schottky) Koidz. (= Q.shottkyana ). – For Susana Valencia-Avalos, 2004, Q.edwardsiae C.H. Mull 1942 ( Amer. Midl. Naturalist 27: 47 2) is a separate species in Nuevo Leon; – Easely recognized by its glaucous, dull and glabrous leaves, with entire or undulate margin or with 1-7 pairs of basally broad, mucronate teeth.