Not all invasive weeds announce themselves with rough and tumble or strawy appearances. Sometimes, they come dressed as eye-popping purple ... ID this weed, look for clusters of purplish-pink ...

This aggressive weed ... bent over. Flowers are deep rose, violet or purple, occasionally white; they are subtended by broad, spine-tipped bracts. Fruits are 3/16 inch long, shiny, yellowish-brown ...