Photo: Verbena rigida.

Flowering tops. Turku bot.g., Ruissalo, Finland. Planted. 2004-08-26.
Verbena rigida Spreng. Engl.: tuberous vervain. Deu.: Starres Eisenkraut, Steife Verbene, Steifes Eisenkraut. Suom.: siniverbena. Sven.: violverbena
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Photo: Verbena rigida.