Barnyard grass is a vigorous, warm season annual grass reaching 1 to 5 feet in height with bases of many stems reddish to dark purple. Leaf blades are flat, 3/8 to 5/8 inch broad, smooth, and without ...

Canada thistle is a colony-forming perennial from deep and extensive horizontal roots. Stems are 1 to 4 feet tall, ridged, branching above. Leaves are alternate, lacking petioles, oblong or ...

Invasive species could cost one state hundreds of millions of dollars if they are not contained. A report by the Wyoming Weed ...