Centaurea crassifolia Centaurea spathulata Palaeocyanus crassifolius Dostál Cheirolophus crassifolius, the Maltese centaury, Maltese rock-centaury or Widnet il-Baħar, is a species of flowering plant in the family Asteraceae.

It is scarce but widespread in the wild on the western cliffs of Malta, rare on the southern cliffs of Gozo, but frequent as a cultivated species in roundabouts.

It is quite common in the limits of Wied Babu in the south east of Malta.

It was first described by Stefano Zerafa, around 1830, as the only species of the monotypic genus Palaeocyanus.

The variety serratifolia (serrated leaves) is very rare, and only known from Gozo.