Ligurian Yarrow

In Great Britain and/or Ireland:
Foodplant / parasite
Golovinomyces cichoracearum parasitises live Achillea ligustica

Achillea ligustica All. Fl. Fed. 1: 181. 1785
A robust perennial, with a short creeping rootstock; stem 2-8 dm. high, erect, sparingly villous or puberulent, simple, or branched above; leaves oval or ovate in outline, 2-6 cm. long, 1-2 cm. wide, bipinnatifid, with 6-8 pairs of primary divisions, the lower petioled, the upper sessile, sparingly pubescent; primary divisions ovate in outline, spreading; racliis winged, 1-2 mm. wide; ultimate divisions lanceolate or ovate, callous-tipped; heads in rather small flattopped panicles; involucre campanulate, about 4 mm. high and 3 mm. broad; bracts sparingly villous, keeled, the outer lance-ovate, acute, half as long as the oblong acute innermost ones; margins light-brown; ray-flowers about 5; ligules nearly orbicular, 2-3 mm. long, usually white, obtusely lobed; disk-flowers about 20; corollas yellowish-white, sparingly glandular-puberulent, 2.5 mm. long; achenes 1.5 mm. long, bluntly margined.
Type locality: Piedmont, Italy.
Distribution: Nova Scotia to Massachusetts, the Catskill Mountains of New York, and Michigan; adventive from southern Europe.

Achillea ligustica, the southern yarrow or Ligurian yarrow, is a flowering plant in the sunflower family. It is native to southern Europe (Italy, Spain, France, Greece, western Balkans) and sparingly naturalized in scattered locations in North America.