WEED MIGRATION 717 



Saponaeia officinalis, Bouncing Bet. 

 S. VACCAEIA, soapwort (wheat sections). 



Portulacaceae. 

 PoRTULACA OLEEACEA, Purslane. 



Ranunculaceae. 



Ranunculus aboetivus, Small-flowered crowfoot. 



B. bulbosus, Bulbous buttercup. 



B. acris, Tall buttercup. 



R. SEPTENTEioNALis, Swamp buttercup. 



Cruciferae. 



Beeteeoa incana, Alyssum. 



Thlaspi aevbnse, Frenehweed. 



Lepidium vieginigum, Large peppergrass. 



L. apetalum, Small peppergrass. 



Capsella bursa-pastoriSj Shepherd's purse. 



Camelina sativa. False flax. 



Neslia paniculatAj Ball mustard. 



Raphanus eaphanisteum, Jointed charlock (northeastern Iov\a). 



Beassica ae'tonsis, English charlock. 



B. NiGEA, Black mustard. 



SiSYMBEiuM officinale, Hedge mustard. 



S. ALTissiMUM, Tumbling mustard. 



Radicula nastuetium-aquaticum, "Water cress. 



R. AEMOEAciA, Horseradish. 



Baebaeea vxtlgaeiSj Winter cress. 



Capparidaceae. 



PoLANisiA GEAVEOLENs, Clammy weed. 

 Cleome seeeulata, Stinkweed. 



Resedaceae. 

 Beseda lutea. Dyer's rocket. 



Rosaceae. 



Geum canadensEj White avens. 

 Rosa peatincola, Prairie rose. 



