MICHIGAN WEEDS. 



419 



Fig. 211. 



Western Tickseed. Bidens aristosa (Mich.) 

 Britton. Annual or biennial, much branched, 

 more or less pubescent, 30-90 cm. high; leaves 

 thin, lobes narrow; heads numerous, ray flowers 

 6-9, showy; achenes flat, upwardly ciliate 

 bearing two parallel teeth. 



A native found in swamps and wet land. 



Fig. 212 (185). 



Stick-tight. Nodding Bur. Marigold. 



Bidens cernua L. Erect, branched, smooth or 

 rough, annual, 20-70 cm. high; leaves narrow, 

 clasping the stem at the base; heads globose, 

 nodding; ray flowers yellow, 6-10 or more. 



