Working description from Trees of Florida
Sand Live Oak
Quercus geminata Small
Form: Small to medium-sized, semievergreen tree with thick, roughly ridged, and furrowed bark.
Leaves: Alternate, simple, entire, thick, leathery, coarsely veined with veins typically deeply impressed on upper surface, 2 - 12 cm long, 0.5 - 4 cm wide, dark green above, dull gray beneath, margins extremely revolute, making an upsidedown leaf take on the appearance of an elongated bowl; petioles densely pubescent.
Fruit: Acorn 1 - 2 cm long, borne in a tapering cup 7 - 10 mm deep.
Distinguishing Marks: Recognized as the only tree-sized Florida oak with the combination of conspicuously revolute leaves and deeply impressed veins.
Distribution: Deep inland sands, dunes, sand pine--oak scrub, coastal hammocks; throughout northern Florida and southward to Dade and Collier counties.