Viper's-bugloss
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Echium vulgare
Common & widespread in Britain.
The flowers start pink and turn vivid blue, and are 15–20 mm (0.59–0.79 in) in a branched spike, with all the stamens protruding.
The pollen is blue but the filaments of the stamens remain red, contrasting against the blue flowers.
It flowers between May and September in the Northern Hemisphere.
The Latin specific epithet vulgare means common.