Poa bulbosa
A distinctive grass in which the spikelets are replaced by asexually-produced plantlets that will fall and root. My pictures are from Indiana, and I've yet to see it in the southwest.
An inflorescence in Bloomington, IN, 5/4/04.
Closer view of the modified spikelets in Bloomington, 4/29/04.
Crappy picture of plant habit in Bloomington, 5/4/04.