Not at all sure of this but looks like a Ludwigia Repens that doesn't have enough light to get any but green color. Since you just planted them, just give it some time.
I say not sure beause the leaves are too spread apart actually for Ludwigia but just how different will it grow once it gets going in your tank ? Where it was grown the light
they had may have cause it to grow differently from what I'd expect on a Ludwigia.