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Can anyone tell me what this weed is? It's about two feet tall now and the leaves fold in like insect wings at night.

green weed

  • what part of the world is the plant located at? – kevinsky Jul 15 '19 at 10:23
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Looks like Senna obtusifolia, aka sicklepod. On page 25 of this reference it says

"The leaves of S.obtusifolia are photosensitive and the leaflets fold upward by flexible petioles at night or on cloudy days."

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