322 NEW YORK STATE MUSEUM 



one-fourth to 2 inches wide, the bases of the leaves decurrent on the stems, 

 and making the stem appear wing-angled. Inflorescence composed of 

 yellow heads of flowers on long peduncles; each head with ten to eighteen 

 drooping ray flowers, wedge-shaped and three-notched at the apex, sur- 

 rounding the globose, darker yellow disk. 



In swamps, wet meadows and along streams, Quebec to Manitoba 

 and Oregon, south to Florida and Louisiana. Flowering from August to 

 October. The far western form is sometimes regarded as a distinct species. 



Yarrow; Milfoil 



Achillea millefolium Linnaeus 



Plate 26ob 



A very common weed, found everywhere; the feathery, finely dissected 

 leaves, when the plant is small and not in flower, often mistaken by those 

 not acquainted with it for fern leaves. It is perennial by means of root- 

 stocks. Leaves lanceolate or oblong in outline, very finely dissected into 

 narrow, pinnatifid segments. Inflorescence consists of dense, flat-topped 

 clusters of numerous, small, white heads (sometimes pink or purplish), 

 one-sixth to one-fourth of an inch broad, borne on erect stems 6 to 18 inches 

 high. Disk flowers yellow, surrounded by four to six gray-white, or some- 

 times pink or purplish ray flowers; both ray and disk flowers fertile. Entire 

 plant aromatic and pungent, but bitter to the taste. 



Waste ground, fields, roadsides and various other situations throughout 

 eastern North America; naturalized from Europe, where it is native. 

 Flowering from June to November. 



Golden Ragwort; Swamp Squawweed 



Senecio aureus Linnaeus 



Plate 263 



Stems slender, smooth, erect, 6 to 28 inches high, solitary or tufted 

 from a perennial, strong- scented root. Basal leaves ovate, orbicular or 

 oblong-ovate, heart-shaped at the base and long petioled, usually pointed 



