Trichinium siphonandrum Diels Ptilotus auriculifolius is a species of flowering plant in the family Amaranthaceae and is endemic to the north of Western Australia.

It is an erect annual herb, with fleshy leaves at the base of the plant and on the stem, and oval to cylindrical spikes of hairy, densely arranged, green flowers with five fertile stamens.

[2] This species was first described in 1849 by Alfred Moquin-Tandon from an unpublished description by Allan Cunningham, and was given the name Trichinium auriculifolium in de Candolle's Prodromus Systematis Naturalis Regni Vegetabilis.

[7] Ptilotus auriculifolius grows on rocky hills and stony, undulating plains in the Gascoyne, Great Sandy Desert, Little Sandy Desert, and Pilbara bioregions of northern Western Australia.

[2] Ptilotus auriculifolius is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.