I no good at guessing without more data... You'll get better guesses if you give

mature leaf size
measurement of clump and rough age
when it blooms in your location (and how that compares with other bloomers)
description of flowers

I no good at guessing without more data... You'll get better guesses if you give

mature leaf size
measurement of clump and rough age
when it blooms in your location (and how that compares with other bloomers)
description of flowers

try putting a scale that is familiar to all of us in your pix ...

and NOT taking the pix in blinding sun ... it really messes with trying to figure out true color...

ken

The two most common with this look are Gold Edger and Birchwood Parky's Gold. From the size I'd lean towards Gold Edger.