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Argentinian Vervain

 
Argentinian Vervain in a public garden, Dorset
  
 
Cluster of flowers from above
 
 
Side view of flower cluster - corolla tubes
 
 
Close-up of corolla with 3 larger and 2 smaller lobes
 
 
Hairy purple corolla tube with stamens exposed 
 
 
Close-up of 2 of 4 stamens - yellow anthers, white
 
filament. One stamen above the other
 
 
Sepal teeth at base of corolla tube
 
 
Slender, lanceolate, serrate, sessile leaf
 
 
Branched square stems
 
 
 
Argentinian Vervain growing out of a crack in a wall
 
 
Argentine Vervain growing as a weed