Ptilotus alexandri is a species of flowering plant in the family Amaranthaceae and is endemic to the far west of Western Australia.

It is an erect, annual herb with spatula-shaped leaves, spikes of pink flowers and glossy black seeds.

[2][3] Ptilotus alexandri was first formally described in 1974 by Gerhard Benl in the journal Nuytsia from specimens collected by Alex George near Quobba Homestead, north of Carnarvon in 1970.

[4] The specific epithet (alexandri) honours the discoverer of the species and collector of the type specimens, "in recognition of his contributions to the flora of Western Australia".

[2] This species of Ptilotus is listed as "Priority Two" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions,[2] meaning that it is poorly known and from one or a few locations.