Dasyphyllum diacanthoides) is a species of flowering plant belonging to the family Asteraceae native to Chile and Argentina.

The glossy, leathery, leaves, dark green above and paler on the underside and borne alternately, are elliptical in shape with entire margins, and acute apices bearing a single, terminal spine.

Despite its inconspicuous flowers, of little ornamental value, the plant is occasionally grown as a street tree in urban areas of Argentina, because of its dense crown of evergreen foliage.

The bark of Archidasyphyllum diacanthoides is used in its native Chile as a folk remedy (both topical and oral) for blunt trauma:[5] Palo santo or Palo blanco (Flotowia diacanthoides) .— It grows from Ñuble to Valdivia.

[5] When not in flower, however, the plant is easily confused with the highly toxic Solanaceous species Latua pubiflora and this ease of confusion has been responsible for many cases of anticholinergic, tropane alkaloid poisoning by Latua in the Los Lagos Region of southern Chile to which both plants are native.

[6] One of his [ Philippi's informant Señor Juan Renous's ] woodcutters had suffered a strong blow with the blunt end of his axe and went into the forest to get some bark of tayu for it.

[7]The unusual Asteraceae subfamily Barnadesioideae, to which the genus Archidasyphyllum belongs, has yielded phenolic compounds, flavonoids and triterpenoids.