All amaranth edible?

[meforage]

I found some greens growing near my house that look very much like an amaranth, but it didn't match up exactly to any of the pictures, but has the same type of flowers as one, same leaves as another... Are there any poisonous amaranths or no?

[meforage]

Is that amaranth?
If so, which type?
Is it edible?

[meforage]

By the way, a closer look at the leaves shows a lighter, whiter horseshoe shaped area. You can't see it so clearly in the pics.