Culms 1-30 cm, often profusely branching above the base, with 10-25 panicles
per culm. Sheaths pilose on the margins; collars pilose; blades
1-5 cm long, 1-3 mm wide, soon disarticulating, thus many leaves on mature plants
are bladeless. Panicles 0.3-1.5(3.5) cm long, 3-6(10) mm wide, 1-5 times
longer than wide, sessile or almost so, mostly included in the sheaths of the
upper 2 leaves. Spikelets 2.5-3.2 mm, readily disarticulating when disturbed,
otherwise retained within the upper sheaths. Glumes about 3 mm, subequal;
lower glumes pilose on the margins; lemmas subequal to the glumes;
paleas minutely 2-veined; anthers 3, 0.5-0.9 mm. Caryopses
1.3-1.7 mm. 2n = 48.
Crypsis vaginiflora is common to abundant in clay or sandy clay soil in
California, where it was first introduced in the late 1800s. It has since been
found at a few locations in Washington, Idaho, and Nevada, and will probably spread
to additional sites with suitable habitat in the future. It is native to Egypt
and southwestern Asia.