Kivikärsämö

Achillea tomentosa L. Sp. PI. 897. 1753
Alittibus tomentosus Dulac, Fl. Hautes-Pyr. 500. 1867.
Millefolium tomentosum Fourr. Ann. See. Linn. Lyon II. 17: 91. 1869.
A low perennial, with a rootstock; stem 1-2.5 dm. high, erect or ascending, sulcate, simple, villous; leaves 2-5 cm. long, 3-5 mm. wide, linear in outline, densely villous, bipinnatifid, with short crowded divisions, the ultimate ones narrowly lanceolate, spinulose-mucronate; heads rather few, in a dense corymbiform panicle; involucre 3-4 mm. high, 2-3 mm. broad, villous; bracts about 15, in 3-4 series, oval to elliptic, rounded at the apex, yellowish with borders of the same color; ray-flowers 3-5 ; ligules bright-yellow, flabelliform or suborbicular, with 3-5 rounded lobes, 1.5-2 mm. long; disk-flowers 20-25; corollas yellow, 3 mm. long; achenes nearly 2 mm. long, scarcely margined.
Type locality: France.
Distribution: Westford, Massachusetts; adventive from the mountains of southern Europe.