It could be asparagus fern.

If you snip a tip off one of the fronds, does a white, milky, sticky liquid bead at the cut? If so it could be Amsonia. I love using mine in arrangements for the airy look - they require sealing the ends but it's not a big deal.

@party_music50, Asparagus fern was my first guess, too.

We are constantly fighting Asparaguus Fern in our yard, I do not think it in the arrangement. I am no help on what it might be. One of the free plant identification apps might help you.

It might be real asparagus that has opened fully. It's beautiful and gets red berries.