Another mystery plant

Sorry about this guys but I've had this ever since moving here 16 years ago.Somebody told me it was a weed though I've no idea.If you can ignore the centaura montana and the stinging nettle,its the one with acid green 'disc shaped' flowers? I think its a perennial...
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It's a Euphorbia
that's what it is and it looks wonderful at moment .
Aww thanks guys you're the best
I've just got to google it now lol
Yes I just read that Brenda,forewarned is forearmed. I can't believe I was told 16 years ago that it was a weed!! Its selling for £7.99 on some online establishments and I've got several
I guessed that one right
I love Euphorbias but still need to add to my collection. Mi particularly love this one so lucky you 
Thanks for the tip on the sap though, I didn't know that and my lovely neighbour over the road is going to give me some as it has taken over her garden