88 



WEED FLORA OP IOWA 



Marsh Smartweed (Polygonum muhlenbergn (Meisn.) Wats.)- 



Description. — ^A somewhat pubescent or scabrous perennial with 

 large black roots, decumbent or erect; leaves lanceolate to ovate, 

 narrowly acuminate; flowera in rather long hispid spikes; sepals 5, 



Fig. 50. Tanweed, Marsh or Muhlenberg's Smartweed, Devil's Shoe-strine or 

 Shoe-string (.Polygonum muhlenbergn) ; a, plant hairs. Low meadows and 

 nelds. 



(Photographed by Colburn. Brawing by Charlotte M King ) 



FiQ. 50-A. Distribution of Marsh Smartweed 



