Achillea erba-rotta subsp. rupestris, (Porta) I. V. K. Richardson

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 : 161

(f) Subsp. rupestris (Porta) I. В. K. Richardson , loc. cit. (1976)

( A.rupestris Porta ):

Plant caespitose. Leaves simple, entire. Calcicole. Appennini.

Plants similar to 5(b) but with brown hairs on the peduncles have been called Ptarmica Iaggeri Schultz Bip. ex Ascherson , Festschr. Ges. Naturf. Freunde Berlin 245 (1873). They are probably hybrids between 6 and 9.