I took the plastic off a low "greenhouse" a day or so ago to find several of these. They resemble stock, though I last saw stock so long ago that I don't trust my eye. I also have a memory of having been fooled by a plant like this, every year, I suspect; I think it gets a small cluster of white flowers (like stock) at the tip of each "branch," but they're so tiny and sparse that they really aren't worth the space the plant takes up.

I can post another picture after one of these blooms--but does anyone know what it might be? It's apparently quite happy in my 4b Montana yard. 

Ideas, anyone?

Thanks!

Kate