Ptilostemon niveus, (C. Presi) W. Greuter

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 : 243

2. P. niveus (C. Presi) W. Greuter , loc. cit. (1967)

( Cirsium niveum (C. Presi) Sprengel ).

Perennial herb 20-65 cm. Stem white-arachnoid-tomentose. Leaves lanceolate to oblonglanceolate, pinnatifid, sparsely arachnoid-hairy above; segments 2- to 3-lobed, the lobes narrowly triangular, with stout spines 5-9 mm. Capitula 1-5, in a lax corymb. Involucre 37-50 x 32-40(-45) mm; base of outer and middle bracts with 0-4(-7) fine marginal spines 1 -5-2-5 mm on each side, with inconspicuous, white ventral swelling, the apex flat, with a slender spine, deflexed in outer and erecto-patent in middle bracts. Corolla (28—)30—33(—36) mm. Achenes (4-5~)5~5-5 mm; pappus 22-27 mm. Rocky slopes; calcicole. • Mountains of S. W. Italy and N.E. Sicilia. It Si.