Calamagrostis

the seed heads are gone but the stems hold up to the cold weather.  The word "Calamagrostis" is derived from the Greek word kalamos (reed) and agrostis (a kind of grass).  Several calamagrostis grow in my yard.  The green one - 'Karl Forester'

The white varigated one - 'Overdam'

The yellow varigated one - 'E-----