Scotch thistle is native to Europe and eastern Asia.
Saltcedar was introduced from Eurasia and is found throughout the United States.
Russian knapweed is native to Eurasia. It infests rangelands, field edges, pasture, roadsides, and other disturbed soils.
Originally found in the Mediterranean area, quackgrass infests crops, rangeland, pasture, and lawns.
Native to Eurasia and Africa puncturevine can be found along roadsides, in cropland, pastures, and waste areas.
Poison hemlock is a European native, growing 6 to 10 feet tall. It is commonly found along waterways, roadsides, and field edges and tolerates poorly drained soils. It has been mistaken for parsley and wild carrot. All parts of the plant are toxic.
Native to North America and Europe, phragmites is a weed in wetlands, marshes, and waterways, where it can form impenetrable stands.
Sorghum grasses include many different variants and can hybridize easily with each other, Johnsongrass and Sorghum-almum are two perennial species with particularly invasive habits
Native to southern Europe and western Asia, perennial pepperweed is commonly found in wet drainage areas of waste areas, ditches, roadsides, and crop lands.
Native to southern Europe and western Asia, musk thistle thrives in pastures and rangelands, in waste areas, stream banks, and road sides.