Ptilotus angustifolius, commonly known as regal fox tails,[2] is a species of flowering plant in the family Amaranthaceae and is endemic to South Australia.

It is a low, bushy herb with several stems, narrowly egg-shaped leaves at the base of the plant, oval, intensely fragrant spikes of purple flowers and cylindrical heads of many long, hairy fruits.

angustifolius in the journal Mitteilungen der Botanischen Staatssammlung Munchen from specimens collected by Max Koch in the Flinders Ranges in 1901.

[4][5] In 2018, Timothy Andrew Hammer raised the variety to species status as Ptilotus angustifolius in Australian Systematic Botany.

[7] Ptilotus angustifolius grows on rocky slopes or hills in association with Eucalyptus microcarpa, from near Quorn to Victor Harbour.