It's hard to tell from the photo, but it could be Carex 'Evergold' and some kind of Pennisetum mixed. They could also be very close together, but that would be easy to tell by simply getting into it and moving the foliage aside to see.

It's also possible the Pennisetum self-seeded itself into the clump of Carex. I've had that happen with several different grasses.

You should be able to ID the green one when it blooms, and the Carex should have already bloomed.