Your little barley plant, hordeum pussilum, reminds me of a grassy plant that grew all over Central Texas when I was a kid. We like to play with the seed heads.

Your little barley plant, hordeum pussilum, reminds me of a grassy plant that grew all over Central Texas when I was a kid. We like to play with the seed heads. You can make them walk up your arms if you press your forearms together, lay the seed head in the center and then move your arms back and forth (towards and away from) your body. The spikes on the seed heads cause it to walk along your arms. It's a fun thing to show little kids. I have a similar plant growing on my place here in N Texas now and I demonstrated this to my kids when they were young and more impressionable.