Answer: Of course I can't say for sure, but it sounds like spiderwort (Tradescantia virginiana). The plant description (from the Audubon Society Field Guide to North American Wildflowers) says that "the flowers open only in the morning; the petals then wilt and turn to a jelly-like liquid". They range from Connecticut south to NW Georgia, west to Missouri, north to Wisconsin. Fascinating, isn't it?
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