Ostrya occurs as genus of eight to ten small deciduous trees belonging to the birch family Betulaceae. Its most common title is Hophornbeam inside Western English & Hop-hornbeam within British English.

A genus is indigene within southern Europe, southwest and eastern Asia, and North and Central America. It have the conic or even irregular crown & a scaly, rough in bark. It own replacement & double-toothed birch-like leaves 3-10 cm long. A flowers are produced within spring, sustaining male ament Five-10 cm yearn & female ament Two-Five cm yearn. A fruit form in cernuous clustering Three-8 cm hanker using 6-20 seeds; each seed occurs as little nut 2-4 millimeter hanker, fully enclosed around the bladder-bladdery involucre.

A wood is very hard & heavily; a title Ostrya is from either a Greek word 'ostrua', "bone-like", on to the super strong wood.

Species
Ostrya carpinifolia Scop. - European Hop-hornbeam Ostrya chisosensis Correll - Chisos Hophornbeam, Heavy Bend Hophornbeam Ostrya guatemalensis (Winkler) Rose - Central U.s. Hophornbeam Ostrya japonica Sarg. - Japanese Hop-hornbeam Ostrya knowltonii Coville - Knowlton Hophornbeam, American Hophornbeam, Wolf Hophornbeam Ostrya multinervis Rehd. - Central Chinese Hop-hornbeam Ostrya rehderiana Chun - Zhejiang Hop-hornbeam Ostrya virginiana (Mill.) K. Koch - Eastern Hophornbeam, Our contries Hophornbeam, Ironwood. Ostrya yunnanensis Hu - Yunnan Hop-hornbeam † Ostrya oregoniana (fossil)