Specimens of the knapweed nematode Subanguina picridis (Kirjanova) Brzeski obtained from different host plants were highly variable in measurement and structure. This variability refutes the validity of six Subanguina species attacking plants in the Asteraceae.

A taxonomic account of the Centaurea parlatoris complex (Asteraceae), endemic to Sicily, is presented. This includes six taxa, three described in 19th century (C. parlatoris, C. var. tomentosa and virescens) recently sicana, giardinae heywoodiana). Starting from designation types for oldest plant names that have not been typified yet, considerations are formulated virescens elevated rank specie...