WordNet sense 1 (handsome East Indian evergreen tree often planted as an ornamental for its fragrant white flowers that yield a perfume; source of very heavy hardwood used for railroad ties):

ironwood, rose chestnut, Mesua ferrea

WordNet sense 2 (a small slow-growing deciduous tree of northern Iran having a low domed shape):

iron-tree, iron tree

WordNet sense 3 (medium-sized hop hornbeam of eastern North America):

Eastern hop hornbeam, Ostrya virginiana