The flower looks like blue mist but the leaves don't.

It's a relative of the blue mist flower; Fragrant mistflower (Eupatorium havanenese possibly), also commonly called 'boneset'. It's very fragrant and the butterflies just LOVE it. I think it is a Texas wildflower. I'm jealous because your's is blooming before mine. I also have a purple form.

For anyone interested in fall blooming fragrant butterfly plants here's some photos of the white and also the purple form, which grows larger. If you look closely at the last picture you can spot a butterfly or two:

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I don't suppose you know where you bought the seeds? I have the regular blue mist, but I'd like to have that one too.

Thank you for the identification. I have no idea where it came from, but sure do like it - Marti, if you'll email me I'll send you some seeds later.

Roselee, your pictures are gorgeous, especially the first one! I noticed just today that the butterflies have arrived on their migration, we sat on the patio and enjoyed them so much.