Ostrya
 Ostrya is a genus of eight to ten small deciduous trees belonging to the birch family Betulaceae. Its common name is Hophornbeam in American English and Hop-hornbeam in British English. It may also be called ironwood a name shared with a number of other plants.The genus is native in southern Europe southwest and eastern Asia and North and Central America. They have a conical or irregular crown and a scaly rough bark. They have alternate and double-toothed birch-like leaves 3–10 cm long.