'Acacia atrox' subsp. 'planiticola' (Fabaceae: Mimosoideae), a new threatened subspecies from the North Western Plains of New South Wales, Australia

'Acacia atrox' Kodela subsp. 'planticola' Kodela & L.M.Copel., a new, rare and threatened subspecies, is described and illustrated. Notes are also given on its distribution, habitat, etymology and conservation status. The subspecies is known only from a single population in Kirramingly Nature Reserve on the North Western Plains of New South Wales, Australia. With its unusual, sharply pungent-pointed, sessile, basally dilated phyllodes, subsp. 'planiticola' appears to be closely related to typical 'Acacia atrox' Kodela, and both taxa are thought to be clonal with plants spreading vegetatively beneath the ground via root suckers. Although all plants are in a conservation reserve, 'Acacia atrox' subsp. 'planiticola' is considered threatened due to its small population size and its vulnerability to stochastic events