The inflorescence is dark colored and spiny-fluffy.
More and better views are all over the internet, as
this is a dangerous invasive taking over the Sonoran Desert.
Spiny fascicles with several spikelets each.
When the seeds fall off, the seedhead remains as a
zigzag spike.
How to Identify Buffelgrass
There are many internet sites that show how to identify Buffelgrass.
I suggest this one.
https://www.desertmuseum.org/buffelgrass/buffelgrass_identification.pdf