arboret

from The Collaborative International Dictionary of English v.0.48

Arboret \Ar"bo*ret\, n. [OF. arboret, dim. of arbre tree, L.
   arbor]
   A small tree or shrub. [Obs.] --Spenser.
   [1913 Webster]

         Among thick-woven arborets, and flowers
         Imbordered on each bank.                 --Milton.
   [1913 Webster]