''Arctium minus'', commonly known as lesser burdock, burweed, louse-bur, common burdock, button-bur, cuckoo-button, or wild rhubarb, is a biennial thistle. This plant is native to Europe, but is now widespread throughout most of the United States as a common weed.
Specie identified by Joost Thissen
Characteristics: It can grow up to 1.5 meters tall and form multiple branches. It is large and bushy. Flowers are prickly and pink to lavender in color. Flower heads are about 3/4 inches wide. The plant flowers from July through.. more