Plants grow to between 1.5 and 3 metres high and have narrow phyllodes that are between 4 and 10 cm long. The cream to yellow flowerheads appear in racemes of 4 to 10 in the axils of the phyllodes. These appear predominantly between June and September in the species native range and are followed by straight or slightly curved seed pods which are 4 to 11 cm long and 5 to 7 mm wide.
The species occurs on sandstone in dry sclerophyll forest in the Blue Mountains in New South Wales. It was first formally described in 1916 by New South Wales Government Botanist Joseph Maiden in Journal and Proceedings of the Royal Society of New South Wales, based on specimens collected from Byrnes Gap near Yerranderie. The species epithet honours botanical artist Margaret Flockton.
- "Acacia flocktoniae". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government, Canberra. Retrieved 14 March 2011.
- "Acacia flocktoniae". PlantNET - New South Wales Flora Online. Royal Botanic Gardens & Domain Trust, Sydney Australia. Retrieved 14 March 2011.
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