iron oak

(noun) small deciduous tree of eastern and central United States having dark green lyrate pinnatifid leaves and tough moisture-resistant wood used especially for fence posts. Synonyms: post oak, box white oak, brash oak, iron oak, Quercus stellata.

(noun) medium-sized evergreen of southwestern United States and northwestern Mexico with oblong leathery often spiny-edged leaves. Synonyms: canyon oak, canyon live oak, maul oak, iron oak, Quercus chrysolepis.