Sensitive Briar

Mimosa microphylla or little leaf sensitive briar is a commonly overlooked wildflower and is blooming right now (mid-September) along roadsides. It is also know as catclaw briar because of its sharp small thorns. I suppose if you fell into it, it might scratch you a bit, but under normal circumstances, it's not a real hazard. It is however, a real pink powder puff beauty, and an added interesting bonus is the way the leaves fold up when you touch them, hence the name sensitive briar.
It is a member of the pea family (Fabaceae) and like all members of the family, the fruit is a pod. It is a perennial, and spreads in a sprawling manner from about 18 inches to 3 feet.