Question: Found in Cambridge, MA flowered in September.
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Question
Found in Cambridge, MA flowered in September.
Answer
Dear whtien, the plant in your images is a species of Bidens (beggar-ticks). It is either Bidens frondosa (Devil's beggar-ticks) or Bidens vulgata (tall beggar-ticks). I would need to see a close-up of the flower heads to help you know for sure which one it is.
