WEEDS AND WEED SEEDLINGS. 47 



loose clusters, terminal or axillary. The fruits or " seeds " are rough, 

 black, and triangular. ' 

 Docks are among the worst weed pests of the farmer and gardener. 



Fig. 19. 



Left: Knotweed (Polygonum Aviculare Jj.). Eight: Black Bindweed 

 (P. Convolvulus L.). Both x f. 



and occur both in arable and grass land. They are well known to all 

 as perennial weeds with large fleshy tap roots, broken portions of 

 which are capable of forming new plants by means of adventitious 

 buds, while they have great power of resisting drying. It is there- 



