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Argentinian Vervain

Argentinian Vervain wild 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