xviii KEY TO WEEDS 



(a) Leaf margin coarsely serrate or toothed 



(b) Leaf margin finely serrate 

 x. Upright plants, 2-6 feet tall 



y. Plants lower, flowers in heads 

 (x) Flowers white or whitish 

 m. Plants creeping 



n. Plants ascending or erect 

 (y) Flowers deep pink 



b. Leaves with more than 3 leaflets 



(1) Leaves palmate 



(a) Leaves silvery underneath, plants creeping 



(b) Leaves green both sides, plants tall 



(2) Leaves pinnate 



(a) Leaves with 5 (rarely 3) leaflets, flowers purple, in spikes 



(b) Leaves with numerous leaflets, flowers yellow, not in spikes 



Potent ilia monspeliensis: 



cinq/oil 



Melilotus alba: sweet clover 



Tri folium ripens: white 



clover 

 Trifolium hybridum: alsike 

 Tri folium pratense: red 



clover 



Potent ilia argent ea: silvery 



cinq foil 

 Cannabis saliva: hemp 



Petalostemon purpureus: 



prairie clover 



Cassia chamaecrista: part- 

 ridge pea 



