ShiShi has it right. Based on the pictures I saw on the link she posted, this is definitely a Velvet Leaf. So glad I asked because I wouldn't want it propagating all over my backyard even though it's kind of a pretty weed.
Thanks everyone for your feedback. I agree on the one post that this isn't a cucumber plant. Although the leaves and flowers look just like a cucumber plant, this plant has star shaped spikey "buds" to it that I've never seen. Some of them have turned from green to black. I think I'll let it continue to grow to see what changes happen to it.
If you look at the picture closely (sorry, should have posted a close up), there are star shaped things growing off of some stems. Some of them have turned black. These look totally different than the flower buds, and they will not flower like the other flowers. ... View related article.
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