This is heuchera 'Lime Marmalade' and it is fabulous. I think it can replace 'Lime Rickey' or 'Key Lime Pie'. It is related to 'Marmalade' which is a hardy caramel colored heuchera. 'Lime Marmalade' seems to grow faster and have a bit larger leaves than the other chartreuse green ones. In my picture you can see a small rust colored dot to the right. It might be rust. I removed the leaf and threw it away. Never compost your diseased leaves. I will watch for any other dots on leaves. I will remove them as needed. If the plant gets really bad I can always use Serenade. For now I think the problem is solved.