Hophornbeam or American Ironwood(Ostrya virginiana) 北美鐵木
Native deciduous tree. Its timber is very dense! Easy to grow. Best growing in partial shade location. USDA Zones:4-9. Mature size:20′-40′(H/W). Fall foliage from green to yellow/orange. Propagate by seeds. Slow growth. Plant may cause skin irritation/allergic reaction, wear gloves!
Reference links: https://en.wikipedia.org/wiki/Ostrya_virginiana http://davesgarden.com/guides/pf/go/56489/ http://www.wood-database.com/hophornbeam/ https://www.ontario.ca/page/ironwood