Kitchener, ON(Zone 5A)

I have had this flower for many years. I have no idea what it is and would appreciate any help.
It is a night bloomer. The flower is approx. 2 to 3 inches across and a lemon yellow. Every night at dusk I get a new one which prompyly dies in the morning. In the picture you can see the new flower buds waiting to open. The leaf is much like a dandelion. The seed pod is black.

Thumbnail by Gwydion
Westbrook, ME(Zone 5a)

This looks like a evening primrose of some sort (oenothera). Not sure which one though. It looks similar to Missouri primrose but I don't recall the leaves being serrated like that.

Gwydion

How many petals on the flower?

south central, WI(Zone 5a)

I have several of these plants, my tag says Oenethera acaulis "Aurea"; my favorite plant place also lists oenethera flava as having serrated leaves-the 2nd he lists as pale yellow. I love these, they (both) open exactly at dusk, you can actually see the petals unwind. They have a tap root, so transplanting has to be done carefully. They do re-seed, as the seed pod is at the bottom of the spent bloom. I went out to get the tag and had 17 in bloom. Enjoy!

Kitchener, ON(Zone 5A)

That is most definitely it! Oenothera acaulis aurea. I couldn't find much on the net about this particular Oenothera but through trial and error I've figured out it's wants and needs over the last few years anyway.
Thankyou all so much. I thought this would be more difficult.

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