328 CLASS XIX. ORDER II. 



A weed about houses, rubbish, and cultivated grounds. Stem 

 erect, branching, leafy, smooth. Leaves alternate, pinnatifid, 

 and toothed, those of the stem clasping. Flowers terminal, scat- 

 tered, vellow. Calyx somewhat cylindrical, calyculated, scaly, 

 the scales acute and black at the tip. Flowers floscular. Down 

 sessile, white. — All summer. — Annual. 



Senecio hieracifolius. Mich. Hmvhceed Groundsel. 

 Flowers without ray ; leaves clasping, oblong, 

 acute, unequally torn and serrated; calyxes oblong, 

 smooth, bristly at base. 



A rank, tall, annual plant, called Fire ivecd in many parts of 

 the interior, fronn the readiness with which it appears in grounds 

 newly burnt over. Stem three feet high, fleshy, succulent, 

 branching at top. Leaves large, clasping the stem, deeply and 

 irregularly divided, and acutely toothed. Flowers terminal, 

 erect, crowded. Calyx cylindrical, its base swelling, and invest- 

 ed with many small leaves or bristles. Florets small, pale, 

 gradually filling the calyx. The whole plant has a strong, nau- 

 seous odor. — Road sides. — August, September. — Annual. 



Senecio aureus. L. Golden Senecio. 



Flowers radiate; radical leaves crenate, heart- 

 shaped, petioled ; upper ones pinnatifid; lyrate ; pe- 

 duncles incrassated, somewhat umbelled. 



This is a handsome species, and makes a fine appearance in 

 meadows, in May and June. Stem upright, simple, smooth, 

 from one to three feet high. Leaves of the root on slender foot- 

 stalks, heart-shaped, rounded, crenate, smooth; middle leaves of 

 the stem lyrate and crenate; upper ones pinnatifid. Corymb 

 terminal, somewhat umbelled, the flower stalks thickening up- 

 ward. Calyx smooth, dark, often striped. Flowers yellow." 

 Ligules oblong, spreading. — Perennial. 

 Senecio obovatus, Willd. Obovate Senecio. 



Flowers radiate ; radical leaves obovate, crenate- 

 serrate, petioled; stem leaves pinnatifid, toothed; pe- 

 duncles elongated ; somewhat umbelled. 



