Quercus hintoniorum Nixon & C.H.Mull.

Mexico(Coahuila, Nuevo Leon) ; 2600-3300 m;

rhizomatous shrub ; may exceed 4m tall;

4-8 cm long, 2-4 cm wide; sub-evergreen; thick, leathery; obovate to broadly elliptic; apex dentate-rounded or sub-acute; base cordate, seldom cuneate; margin more or less rolled under along sinuses, with 2-5 pairs of bristle-tipped teeth; adaxially dark green, sparcely corvered with fasciate hairs, glabrescent; pubescent beneath with fascicled and glandular hairs (becoming scattered with age), glandular hairs, very small, are on the whole underside of the blade, fascicled ones in rusty tufts only along secondary veins; 4-6 pairs of secondary veins, impressed adaxially ; underside somewhat papillose; petiole glabrous, reddish, 3-6 mm long;

staminate inflorescence 5-6 cm long; pistillate inflorescences 1 or 2-flowered on tomentose peduncles 2-7 mm long;

acorn 0.6-1.5 cm; ovoid; sessile or nearly so; singly or paired, cup with flar, appressed, rusty tomentose scales, enclosing 1/4 or 1/3 of nut; maturing in 2 years;

hardiness zone : 7;

– Sub-genus Quercus, section Lobatae, Series Erythromexicanae; – Threatened (IUCN Red List Category : VU). – Related to Q.hypoxantha with which it forms the “ Quercus hypoxantha complex “, in association with Q.coahuilensis and Q.miquihuanensis ; similar to Q.hypoxantha , but differs in the type and distribution of leaf and twig pubescence, habit, and geographic distribution;