night bloomer identification

I posted pictures of a plant I know as night bloomer. can anyone help me identify the correct name. alt.binaries.pictures.gardens The flowers last one night and the seeds are formed at the base of the dandelion like plant.
Thanks
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Dana
www3.sympatico.ca/lostmermaid
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What zone are you in? Suzy O, Wis. zone 5

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I'm in zone 5b, Ontario
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Dana
www3.sympatico.ca/lostmermaid
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