dark leaves and lil yellow flowers

Hi crew,
Now then, I don't have a photo, but, I bought a campanula plant in the summer, which is bloomin lovely (did you see what I did there )
The thing is, it seems to have been a buy one plant, get a mystery one free
Alongside it, I have a plant with very dark (a kind of blackish colour) leaf, with little yellow flowers.
Any ideas? Too dark for a photo now.

 

Does it look like this?

 

That could be it I must admit that I haven't looked too hard at it.
If its not that, its very similar, especially the leaf colour.

 

Root it out quick, NG...every last tiny bit, or it will take over your entire garden!

 

If you need any more of it I can sell you some.

 

So what is it? I will have to do it next Saturday. My whole garden is full of stuff to root out fast it seems

 

Could you take a pic of it, NG?

 

Could be Oxalis pes-capre but there is another more annoying one here that 'pops' and spreads seeds everywhere ... more of a herb ... ... what is the name ... ???????? ... a Sorrell of some sort me'thinks!

 

Its too dark for pics by the time I get home @Lea
If I think of it tomorrow, I will try

I don't think its Oxalis, I just googled it. My leaves are dark, not dark green. Thanks for the input though

 

The pic I posted is Oxalis Corniculata, once the seed pods burst you will have it for life.

 

Should I blast the garden centre?

 

Not only that. Once the roots are strong enough it will form minute bulbils and you need to remove all of these too (they're very small).

 

Yes, I agree with the Oxalis corniculata, but I've just always called it Creeping Sorrell or Wood Sorrell. I have probably over 50 pots here and there and there probably isn't a one of them without this horror in it! Actually, that's a chore for me today, attempting to eliminate more of it but I know it will only be temporary ...

Of course, I could always eat or drink it ... http://en.wikipedia.org/wiki/Oxalis_corniculata

Edit: On the other hand, I have several times planted the Pink Sorrell, Oxalis articulata, and it manages to die/disappear/never to return again.

 

Now for the final verdict .....

 

Well we had thunderstorms and rain so I didn't get to pull any of these out of pots.

NG ... chew on a leaf and see if it tastes lemony!