Definition of "arboret"

No arboret with painted blossomes drest, / And smelling sweet, but there it might be found […]

1590, Edmund Spenser, “Book II, Canto VI”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie

Then voluble and bold, now hid, now seen, Among thick-woven arborets and flowers.

1667, John Milton, Paradise Lost‎

And arborets of jointed stone were there, And plants of fibres fine as silkworm's thread.

1810, Robert Southey, The Curse of Kehama‎