Inland Sea Oats (Chasmanthium latifolium)
This is another native plant to Texas. It can be invasive! I've controlled it by cutting the seed heads off before they dry and by pulling up little seedlings in the spring. It covers a pretty large portion of a bed in the shade. It's not just beautiful but easy to grow (a little too easy) and drought tolerant. I love how the seeds dangle and dance in the wind.