Quercus breedloveana Nixon & Barrie

Mexico (Chiapas, Guerrero);

to 20 m heigh and more;

9-21 cm x 2.4-6; narrowly elliptic or elliptic-lanceolate, 3-4 times as long as wide, very symmetrical; apex acuminate to caudate-acuminate, sometimes slightly falcate, usually with a 1-5 mm long bristle; base cuneate or narrowly cuneate, or narrowly rounded-attenuate, sometimes oblique; margin undulate, with or without short triangular teeth ending in a 1-4 mm long bristle, the number of bristles reaching 12 to 20 each side; adaxially glabrous, slightly lustrous, with flat veins; abaxially paler green, hairless or seldom with some axil tufts, with prominent veins; 6-14 vein pairs, straight and ascending, regularly spaced, terminating in a bristle except the lowermost ones; petiole 0.6-4 cm, red basally, glabrous;

acorn 1.4-1.7 cm long, 1.3-1.5 cm wide, glabrous or remotely puberulent; broadly ovoid or globose with a somewhat depressed apex; solitary or paired; cup turbinate enclosing 1/3 of acorn; fruit annual;

– Sub-genus Quercus, section Lobatae, series Erythromexicanae, Group Acutifoliae; – Differs from Q. paxtalensis which has likely asymmetrical leaves, a round or truncate base, often longer petiole (2-4.5 cm) and ovoid-cylindrical acorns. It differs also from Q. cortesii which has shorter petioles (0.6-1.5 cm), and less bristle-tipped teeth, only on the apical 1/2. – Resembles Q. xalapensis and Q. skinneri , but both have much larger acorns maturing in 2 years, and halfround cupules.