Kalmar "Corylus cornuta" tana nufin wani nau'in itace mai tsiro ko ƙananan bishiyar da ke cikin dangin Birch (Betulaceae), wanda aka fi sani da "baked hazelnut" ko "ƙahon hazelnut". Bishiyar ta fito ne daga Arewacin Amurka kuma tana iya girma zuwa tsayin ƙafa 20. An siffanta shi da fitaccen doguwar sa mai kama da baki wanda ke kewaye da goro. Kwayoyin da kansu ƙanana ne, masu daɗi da kuma ci kuma sanannen tushen abinci ne ga tsuntsaye da ƙananan dabbobi masu shayarwa. Sunan kimiyya "Corylus" ya fito ne daga kalmar Helenanci "korys", wanda ke nufin "kwalkwali", "cornuta" kuma yana nufin "ƙaho" a cikin harshen Latin, yana nufin siffar husk.