Hi Sue, From your excellent photos, I could see the opposite leaves, its margins, veins and the clear shot of its flowers. Also from your great description of the plant’s habit. These tips helped quickly in narrowing down its genus. Thanks to your plant post, now other plant enthusiasts know about this beauty. Best wishes! Laura

That’s it!!! Thank you both so much. Could you tell me how you figured out the kind of plant? I’v been searching for several years. Thanks again, Sue

Ditto. I have some additional pics: http://stonethegardener.tumblr.com/tagged/Collinsonia

Maybe a species (Collinsonia) genus (?). Check out one of the species in the group; the C. verticillata (whorled horsebalm). Best wishes! http://www.alabamaplants.com/Whiteopp/Collinsonia_verticillata_page.html