I'm pretty sure that's it,! Oenothera macrocarpa...according to the pic. According to the article Remy linked to, This species is a perennial with a fairly short bloom period. Its flowers may be seen in May and June, with the peak being mid-May in Kansas. Like I said b4...mine blooms off and on all season, and is a real favorite. I am clueless where it even came from. Thank you everyone. You all are the bestest and so knowledgeable. I refer lots of folks over here, telling them someone can most likely help them with an identity, even with just a good description. Sue...happy to have that solved.

How about you tell us whereabouts you are located? People post here from all over.

morz8 - THANK YOU!!! I am so glad to see your post about these being invasive in CT. I was "gifted" with seeds in a trade and before winter sowing them, checked to see if they were invasive here. They will go into the DO NOT PLANT bin until I can dispose of them properly. E in CT

Glenda another thought on this: I have lots of this on my driveway and also the white flowering crownbeard. I enjoy these wildflowers after a dry summer when everything perks up after a nice rain. I do not even attempt to weed or mow the ditch where these grow. They take care of themselves and I do no work. I agree they are pretty, but put them just outside your yard in your fence rows or ditches. You will enjoy them as you are the one you found. Jerusalem Artichoke is also showy this time of year. I let it grow in my tomato garden then pulled most of it up one time after a rain. They say JA is too wild and invasive for a garden, but I found it easy to pull up where I didn't want it. It is very pretty now. Because it takes up so much room I am also growing it on the edges of my yard. I can enjoy it but I let it take care of itself.