MICHIGAN WEEDS. 



433 



Fig. 232 (203). 



Marsh Elder. Iva xanthiifolia Nutt. Annual, coarse roufh, light colored with 

 minute down, 60-180 cm. high; leaves mostly opposite, ovate or rhombic, three-ribbed, 

 more or less lobed; heads small, crowded in panicles. Waste places in the Upper Pen- 

 insula. 



