Class XIX. Order II. 193 



linear-lanceolate, less woolly than the stem. Flowers in dense, 

 terminal corymbs or heads. Scales of the calyx yellowish. 

 Road sides. August. Annual. 



231. CHRYSANTHEMUM. 

 CHRYSANTHEMUM LEUOANTHKMUM. L. White weed. 



Leaves clasping, oblong, blunt, cut, pinnatifid 

 at base ; the radical ones on footstalks, obovate. 

 Sm. 



This plant, which has come to us, no doubt, from Europe, 

 is exceedingly frequent and troublesome in pastures and mow- 

 ing land. Stems about two feet high, round, furrowed. Lower 

 leaves petiolcd, inversely ovate, serrate, and cut ; upper ones 

 sessile, irregularly pinnatifid and toothed. Flowers terminal, 

 solitary, large, and flat. Calyx closely imbricated. Disc yel- 

 low ; ray white, consisting of many oval, oblong ligules, ending 

 in three teeth. June, July. Perennial. 



232. ERIGERON. 

 EUIGERON CANADENSE. L. Annual Flea-bane. 



Stem hairy ; flowers panicled ; leaves lanceo- 

 late, lower ones serrate. Sm. 



One of the most hardy and common annual weeds. It prop- 

 agates itself rapidly, and since the discovery of America, has 

 been introduced, and spread through most countries in Europe. 

 Stem erect, furrowed, very hairy, branching. Leaves linear- 

 lanceolate, edges rough and ciliate. Flowers small, of no 

 beauty, very numerous, arranged in a sort of racemes on the 

 branches. Calyxes cylindrical, longer than they are wide, 

 somewhat imbricate. Ray very short and obscure, white, 

 crowded, erect. In pastures, road sides, and cultivated 

 grounds, varying in height from one to four feet, according to 

 the soil. August. 



