I am ambivalent about this weed, so I will let you be the judge of whether it is a nuisance or not.  The weed that I am referring to is called basket grass, or Oplismenus hirtellus ssp. setarius.  This subspecies of O. hirtellus is actually considered a native grass. The plant is found naturally from the Florida Keys to North Carolina along the coast to Texas. Various other species and subspecies are invasive exotics in other parts of the country and world.  

 Basket grass is a cute little low-growing grass, staying under three inches that loves shadier areas of the lawn or flower beds. It’s a perennial that produces little spikelets of purplish-red flowers.  It will creep along the ground creating a moderately dense groundcover in shady, moist areas. The seeds have little spikes on them that readily cling to animal fur or clothing.  As the seeds ripen in the fall, they become food for small seed-eating birds.  You can see that it is readily spread by its seed.  It can quickly invade flower beds or lawns that are somewhat shaded.

The good news is that it can be easily pulled. However, do this before it blooms and sets seeds.  It can also be knocked down  in lawns by Crabgrass Killer which is an organic broadleaf weed killer that won’t kill St. Augustine grass.  It can make an attractive dense ground cover for areas where turf grasses will not grow. It will go dormant in dry hot summers, but will definitely return with the rains. If it invades my flower beds however, it will be ruthlessly yanked up by its roots.