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Lachlan lilac
noun a biennial herb, Echium plantagineum, native to the Mediterranean area, but widely naturalised in settled parts of Australia, having blue-purple flowers. Compare Murrumbidgee sweet pea, Paterson's curse, Riverina bluebell, Salvation Jane.
Contributor's comments: I have lived in Wagga for a lot of years and have never heard Patterson's Curse or Riverina Bluebell called Lachlan Lilac, and the Lachlan River is not that far from Wagga.