dwarf or shrub-like tree
• (n.) A dwarf tree, one in size between a shrub and a tree; a treelike shrub.
Ar'bus·cle noun [ Latin arbuscula small tree, shrub, dim. of arbor tree.] A dwarf tree, one in size between a shrub and a tree; a treelike shrub. Bradley. 
arbuscle, arbuscula A dwarf tree, one in size between a shrub and a tree; a treelike shrub.