Sounds to me like a lazy sedge.
I came out of a building the other day with Rachel in tow and stumbled over what most other people would be trying to throw weed killer on. It was growing up out of a crack in the sidewalk. My exclamation of “Oh! Look how cute it is!” was met with “Mom, you are SO weird!”
The arrangement I made of it in a Waterford vase makes it look very different than it does coming out of a crack in the sidewalk, but that’s okay. I love it anyway.