indentifying euphorbia

hello all - I know they are a bit of a marmite plant but I love them and have several in the garden including palustris, wulfenii and oblongata. I now (of course) have many seedlings which I am trying to identify. I had thought they were oblongata, but now starting to doubt. They have red stems- does that rule out oblongata?

thanks- and apologies if a silly question!

 

No, it doesn't. E.oblongata can have red stems.

 

thanks- am leaning towards oblongata as seedlings arrived the season after it did!