Sprawling Horseweed can be identified by its leaves, which have petiole-like bases that are shorter than the blade. It roots at the nodes and can be hairy. Sprawling Horseweed also produces flowers that are yellow and inconspicuous, forming in heads on elongated stalks. It flowers in warm months and reproduces by seeds.
This broadleaf weed thrives in lawns and sandy, open, disturbed areas, such as pastures, roadsides and waste areas. It is found throughout much of the southern United States.
Proper cultural practices, such as proper mowing and watering, can help prevent Calyptocarpus vialis by creating dense grass, which inhibits the broadleaf weed's ability to grow. Physical removal (i.e., pulling weeds) can be effective, though you run the risk of spreading the seeds to additional areas of your lawn.