Black Mustard on shingle, Chesil beach, Dorset
 
 
Flowerheads on branched stems
 
 
Yellow petals, stamens, stigma and linear sepals
 
 
Half-spreading sepals, pods
 
 
Appressed seed pods on tall branches
 
 
Seed pods on shrubby, matted plants
 
 
Seed pods, short beaks and stems
 
 
Guitar-shaped lower leaf
 
 
Wavy middle and lanceolate upper leaves