British Columbia: Gentiana ?

Until a week ago, I thought this was a seedling of a Gentiana tibetica growing in my garden. Then it bloomed. I've never seen, let alone grown, this before and I wonder if someone can tell me its name.

 

Gentianaceae, yes. Not G. tibetica, which you know. Centaurium erythraea, I think.

 

Thank you Daniel - that certainly looks as though my plant is a Centaurium erythraea. It is interesting, but I don't think I'll encourage it to proliferate.