SEEDS AND SEEDLINGS 



FIG. 



nu. o9. Weed seeds: 1, Night-flowering catchfly (Silene erectifolia) ; 2, sheep's sorrel 

 (Rumex acetosella) ; 3, curled dock (Rumex crispus) ; 4, Pennsylvania smartweed (Polygonum 

 pennsylvanicum) ; 5, lamb's quarter (Chenopodium album); 6, tumbling pigweed (Ama- 



