WEED MIGRATION 717 



Saponaria officinalis, Bouncing Bet. 

 S. vaccaria, soap wort (wheat sections). 



Portulacaceae. 

 Portulaca oleracea, Purslane. 



Ranunculaceae. 



Ranunculus abortivus, Small-flowerecl crowfoot. 



R. bulbosus, Bulbous buttercup. 



R. acris, Tall buttercup. 



R. septentrionalis, Swamp buttercup. 



Cruciferae. 



Berteroa incana, Alyssum. 



Thlaspi arvense, Frenchweed. 



Lepidium virginicum, Large peppergrass. 



L. apetalum, Small peppergrass, 



Capsella bursa-pastoris, Shepherd's purse. 



Camelina sativa, False flax. 



Neslia paniculata, Ball mustard. 



Raphanus raphanistrum, Jointed charlock (northeastern Iowa). 



Brassica arvensis, English charlock. 



B. nigra, Black mustard. 



Sisymbrium officinale, Hedge mustard. 



S. altissimum, Tumbling mustard. 



Radicula nasturtium-aquaticum, Water cress*. 



R. armoracia, Horseradish. 



Barbarea vulgaris, Winter cress. 



Capparidaccae. 



Polanisia graveolens, Clammy weed. 

 Cleome serrulata, Stinkweed. 



Resedaceae. 

 Reseda lutea, Dyer's rocket. 



Rosaceae. 



Geum canadense, White avens. 

 Rosa pratincola, Prairie rose. 



