File:Archidasyphyllum diacanthoides empty calyx.jpg

English: Archidasyphyllum diacanthoides (Asteraceae): persistent, open, empty involucre of bracts after dispersal of all the pappus-tufted fruits by the wind. Note hairy, thread-like, persistent structures protruding from central disc. The knapweed-like infructescence with its trichome-fringed scales stands wide open, resembling a flower with light brown petals, contrasting with the leathery mid-green leaves.

The Tayu tree is a curious, arborescent member of the daisy family, Compositae, the bark of which is highly esteemed, in the folk medicine of Chile, as a remedy - both topical and internal - for blunt trauma.

Empty involucre borne by a cultivated specimen of this rare shrub (seldom grown in the UK because not particularly ornamental) growing on the south-facing wall of a private house in Paxton, Scottish Borders, near Berwick-upon-Tweed. Has thus far proved hardy there, thanks to the fairly mild, maritime climate of the narrow, coastal strip of Northumberland abutting the North Sea.