what is this plant
By Donny
Gloucestershire,
United Kingdom 
found in shady woodland, purplish leaves, now has yellow flower(july/august) 5 petals, also thrives in sun. about 2ft tall, thin not bushy. may spead slighty, keeps leaves all year.
On plant
not known
2 Aug, 2008
Answers
Looks like lysimachia to me too!... it's a spreader...I have some in my garden that belongs to the neighbours..it travels..pretty plant looks good with monarda.
3 Aug, 2008
spritzhenry is right. I posted a picture of this in my garden last month (it's on page 3 on my photos now)
3 Aug, 2008
Could it be Lysimachia ciliata 'Firecracker'?
2 Aug, 2008