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.

I don't think it's mullein. The foliage and stems are smooth and the blooms are spread a ways apart on the stem. They look kind of like pea flowers. Karyn

Wow that was fast and the picture from the link looks just like it. Thanks so much CarrieB! Jess

Hi Roger. Nice to see you posting here. I haven't a clue about the clematis but it appears to be quite an unusual one. Just an aside, the pitcheri seedling I had up last year didn't survive my one month absence this past summer. I also haven't had any germinations from the clematis addisonii seed you sent yet. On both counts however, I have subsequently replanted some of the seeds of both the pitcheri and addisonii seed you sent. One pitcheri seedling germinated in approximately three months. I soaked the seeds in hot water overnight as Joan (Bloomsorelse) suggested and think that might have helped hasten germination of at least one seed anyway. I am still hopeful about the addisonii germination and other pitcheri seedlings. I have planted some seed from both of my pitcheri plants as well. I do have a plant tentatively identified as addisonii that I obtained from the owner of a clematis nursery here in the US. Last summer was not a good summer for clematis in my garden--plenty of mildew, little rain, and extremely hot weather. The addisonii did okay and I am hoping to see it do better next summer. Once again, happy to see you posting here and good luck in identifying your friend's clematis.