This is a summer annual with some stems bending and rooting in the lower nodes. It is frequently reddish at the base.
The seed head is a spike of spiny burs.
This plant will grow throughout the south from North Carolina, west to New Mexico.
This is not something you would want to step on or rub against.
Moreover, that is exactly where they like to grow best - in the sandy areas.
Sandspurs do not thrive in well-cultivated pastures and fields. Control is by handpicking.