10/12/92
This thistle, of which you just sent a specimen, dear Mr Hart, is Carduus pycnocephalus, a species under ordinary circumstance of annual duration, and indigenous to the countries at the mediterranean sea.
Regardfully your
Ferd. von Mueller
Carduus pycnocephalus
Please cite as “FVM-92-12-10b,” in Correspondence of Ferdinand von Mueller, edited by R.W. Home, Thomas A. Darragh, A.M. Lucas, Sara Maroske, D.M. Sinkora†, J.H. Voigt† and Monika Wells accessed on