Centaurea napulifera subsp. nyssana

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 300

(d) Subsp. nyssana (Petrović) Dostál , loc. cit. (1976)

(C. nyssana Petrovič; inch C. orbelica Velen. , C. velenovskyi Adamovič ):

Rhizome long-creeping, with or without stolons; roots up to 5 cm, fusiform, spreading. Stem 10-30 cm, simple. Leaves grey-tomentose; lower linear-lanceolate or lyrately lobed, entire or remotely dentate; cauline linear-lanceolate, entire. Appendages broadly (1 mm) decurrent. Outer florets white or pale cream, rarely pale blue or pale purple. S. W. Bulgaria, S. & E. Jugoslavia, N. Greece.