Achillea erba-rotta, All.

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 : 160

5. A. erba-rotta All. , Auct. Syn. Stirp. Horti Taur. 17 (1773).

Sub-glabrous to glabrous. Stems simple, erect or ascending. Leaves simple or divided, ovate to spathulate, rarely lanceolate in outline. Corymbs with 3-15 capitula. Involucre 5-6 mm in diameter; bracts 2-5-4 mm, ovate to lanceolate, with a brown margin. Ligules 4-5 mm, suborbicular to obovate, white. 2/j=18. Mountain rocks, screes and stony pastures. • Alps; S. Appennini; E.C. Greece. Au Ga Gr He It.

Polymorphic, particularly in division of the leaves. Six subspecies are recognized, but intermediate populations are frequent, particularly in the W. Alps and Appennini.

1 Plant caespitose 2 Leaves simple, entire (f) subsp. rupestris 2 Leaves dentate to pinnatifid (e) subsp. calcarea 1 Plant not caespitose 3 Leaves dentate (d) subsp. erba-rotta 3 Leaves pinnatifid 4 Leaves divided to c. J-way (c) subsp. ambigua 4 Leaves divided almost to midrib 5 Cauline leaves shortly petiolate or sessile; peduncles somewhat glandular (b) subsp. moschata 5 Cauline leaves long-petiolate; peduncles densely glandular

(a) subsp. olympica