Elderberry (Sambucus).

Sambucus nigra (the native Elderberry) can be found in garden centres but usually only selected cultivars such as Black beauty, Black Lace or occasionally Variegata. The plain green wild form isn't normally sold. They are easy from hardwood cuttings taken now. Just stick a foot long shoot of this years wood into the soil and it should root by late spring if you want the green one from a hedgerow.

The other Sambucus species normally seen is Sambucus racemosa. There are a couple of yellow leaved forms that are normally seen.