- Siberian elm, Chinese elm, dwarf elm, Ulmus pumila - fast-growing shrubby Asian tree naturalized in United States for shelter or ornament
--1 is a kind of elm, elm tree
--1 is a member of Ulmus, genus Ulmus - Chinese elm, Ulmus parvifolia - small fast-growing tree native to Asia; widely grown as shelterbelts and hedges
--2 is a kind of elm, elm tree
--2 is a member of Ulmus, genus Ulmus