I live in New Mexico (zone 7a) and my yard is basically a desert. However, I was surprised to discover some grass growing near the edge of my patio slab today. I didn't plant it and I certainly haven't watered it, so I was surprised to see it!
I'm hoping someone can identify what this stuff is so maybe I can plant it elsewhere since it seems to like growing here!
Bigger versions here: https://i.stack.imgur.com/VhLg1.jpg