<Li> Nut surrounded by a soft , leafy involucre , multiple - stemmed , suckering shrubs to 12 m tall <Ul> <Li> Involucre short , about the same length as the nut <Ul> <Li> Corylus americana -- American hazel , eastern North America </Li> <Li> Corylus avellana -- Common hazel , Europe and western Asia </Li> <Li> Corylus heterophylla -- Asian hazel , Asia </Li> <Li> Corylus yunnanensis -- Yunnan hazel , central and southern China </Li> </Ul> </Li> <Li> Involucre long , twice the length of the nut or more , forming a ' beak ' <Ul> <Li> Corylus colchica -- Colchican filbert , Caucasus </Li> <Li> Corylus cornuta -- Beaked hazel , North America </Li> <Li> Corylus maxima -- Filbert , southeastern Europe and southwest Asia </Li> <Li> Corylus sieboldiana -- Asian beaked hazel , northeastern Asia and Japan ( syn. C. mandshurica ) </Li> </Ul> </Li> </Ul> </Li>
a deciduous shrub with edible brown nuts a species of hazel
Corylus americana Corylus avellana Corylus heterophylla Corylus yunnanensis Corylus colchica Corylus cornuta Corylus maxima Corylus sieboldiana