Quercus sarahmariae Nixon & Barrie

Costa Rica (Limon, Puntarenas, Chiriqui) ; 700-1900 m:

reaches 45 m and more;

6-22 x 2.5-8.5 cm, nearly 2 to 4 times as long as wide; elliptic to narrowly elliptic; apex acuminate with a 1-2 mm long bristle; base cuneate; margin flat or crisped, entire but, usually, a few leaves show 1-5 triangular teeth in the apical 1/4, if present the teeth are bristle-tipped or not; adaxially dull green, glabrous, with flat veins; abaxially green-bronze, nearly glabrous or pubescent along veins especially at the base of the blade, with prominent veins; 12-15 vein pairs, ascending, straight or acuate, bifurcating distally; petiole 7-22 mm, dark basally, glabrate or with a few hairs;

acorn 2.1-3.6 cm long, 2.3-2.5 cm wide, brown to dark reddish brown, puberulent, cylindric, seldom globose or subglobose, rounded at the tip, base broad and flat; cup 6-10 mm heigh, 24-28 mm wide, saucer-shaped, scales imbricated and thickened basally, finely sericeous; annual; cotyledons free;

– Sub-genus Quercus, section Lobatae, Series Erythromexicanae, group Benthamiae; – Differs from Q. rapurahuensis Pittier ex Seem. in having always at least some leaves with 1 to 5 teeth along the margin on the distal 1/4, and larger acorns (15-20 x 16-20 mm in Q. rapurahuensis ).