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