Photo: Leonurus cardiaca 10.

Young plant, looking all innocent and green. It'll grow up to be a very tall plant with spiny flowerclusters, and it'll self-seed profusely. Perheniemi, Finland. Planted. 2006-08-15.
Leonurus cardiaca L. Engl.: common motherwort, motherwort. Deu.: Echtes Herzgespann, Löwenschwanz. Suom.: nukula. Sven.: hjärtstilla, bonässla, äkta hjärtstilla. Ital.: cardiaca. Bot. syn.: Leonurus quinquelobus Gilib.
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Photo: Leonurus cardiaca 10.