what is this plant?
 

Hi
I have just weeded my border - fairly overgrown with nettles and others. One
particular plant caught my interest as i thought it could possibily be worth
keeping. here's the description
Stands about 10cms high in clumps, thin white stems - like cress - similar
leaf shape to cress too but much, much bigger . Two leaves abit like
clover - but never 3 leaves, lighter yellower varigation.The roots were
unusual - which is what made me think it was planted, bunches of dry, tiny
'chick pea' shaped bulbs - which on bigger plants turned into pale white
triangles like carrots still small though. I decided to pull 'em up as they
had yellow / dark gold spots on the back of their leaves which I didn't want
on my plants. There were so many of them it must be weeds - but we have
recently turned over that patch very deeply to remove a laurel - did these
plants return from a previous garden ????? adn what are they??
Thanks for helping out with my query
Suzanne