What kind of flower is this?

Question:I don't have a digital camera, so I can't take a picture, but it is easy to describe. I live in Indiana - zone 5, and this flower looks like a big weed-bush, about 4' wide and 4' tall. We were going to cut it down at first, but then it started blooming large 1" yellow flowers only at NIGHT. During the day, the flowers shrivel back up and are done, and new flowers bloom the following evening, around dusk. Any ideas?

Answers:
Sounds like a type of evening primrose.

Four O'Clocks only bloom in the evening and at night. Trumpet shaped flower, leaves are spatulate. Here is an image:

http://www.epier.com/biddingform.asp?150...

HEY,SOUNDS LIKE YOU GOT A MOON FLOWER// AWESOME

Moonplant.

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