Please Help To Find Name Of Plant.

A few years ago we had a plant growing on our rockery, although it wasn't necessarily a rockery plant. The garden was left to get untidy and some Ground Elder smothered it and it died off. Now that the garden has ben tidied, we would like to find this plant again and re plant the place where it once was. The only problem is, we never knew it's name and can't find it in any gardening book or garden centre for sale...I would recognise it straight away if I saw it. I can describe it in as much detail as I can and if anyone knows what it is and can post a picture I would be so grateful.
It was planted alongside a plant that use to be called Polygonum Affine 'Donald Lowndes', although I am informed that the name has changed. The plant we are looking for has very similar flowers to the Polygonum but they are just white and the leaves are similar in size and shape but have a slight stripe of varigation on them. The plant itself goes brown in winter and travels along the ground as a runner...the only plant I can say the leaves reminded me of was an indoor Tradescantia. I can't for the life of me remember where my husband bought it from originally but it was probably from a rare plants nursery knowing him. It doesn't grow vey tall and remains as a ground cover. Any help to find the name of this plant would be gratefully appreciated as we have been trying to find it for over a year without success. Many Thanks.

 

Veronica gentianoides "Variegata"?
http://images.google.it/imgres?imgu...ted&start=18&ndsp=18&um=1&hl=it&safe=off&sa=N

 

Good Lord.............that is impressive

 

Granny.................that she is. Very.

 

Eh, I have no friggin idea if that is the bleeding plant, lol. Just thought... may be, sorts of fit the description.

 

Honestly Ivory, how can you possibly come over all modest about your ability to identify plants?

You and Dai just blow me away with how you can both do it!

 

Single minded freaks, lol. :D

 

Actually you have the thing I want the most at the moment-a working knowledge of plants and an ability to recall instantly the botanical name=so you might be freaks but you`re my kind of freaks

 

No that's not it..thanks for trying though. The plant is more dense in it's growth and the leaves are of a dark green colour with a faint varigation on them.

 

See? Told ya, Lollipop!!
My second idea was this: Eupatorium aromaticum,variegated form:
http://www.warwick-gardens.com/images/plants/Eupatorium aromaticum 'Joicus' Variegated'.jpg
Could only find small pics,sorry.

 

No sorry it's not that one either....if you take a look at my link for Polygonum Affine 'Donald Lowndes' here http://www.plantpress.com/plant-encyclopedia/plantdb.php?plant=4569
it has the same flowers but in white and the leaves are also very similar but darker green and with a light varigation...thanks for all your help.

 

Try googling Persicaria microcephala...

 

Thanks, had a look but Persicaria microcephala has different flowers and is taller...the plant we're looking for is lower growing and the leaves are much tougher and thicker.
Thanks, your help is much appreciated.

 

Not much help so far though!

I must change the batteries in my thinking cap I fear.

 

LIATRIS SPICATA (ALBA) ??