It is "Wandering Jew", here is a description from Wikipedia:
"Tradescantia pallida is a species of spiderwort (a genus of New World plants) more commonly known as Wandering Jew, a name it shares with the closely related species T. fluminensis and T. zebrina. Other common names include Purple Heart and Purple Queen. It is native to the Gulf Coast region of eastern Mexico. Edward Palmer discovered the type specimen near Ciudad Victoria, Tamaulipas in 1907."
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