Burr ragweed is an erect perennial herb. Its burrs contaminate wool and pollen can cause 'hayfever'.

Does ragweed produce burrs?

Ragweeds are monoecious, most producing inflorescences that contain both staminate and pistillate flowers. ... The pistillate flowers are wind pollinated, and the fruits develop. They are burs, sometimes adorned with knobs, wings, or spines.

How do you identify ragweed?

Ragweed identification is easy due to the distinct leaves and flowers on the plant. Ragweed is an upright growing plant that has leaves that look almost fern-like, feathery and green. You will also notice that ragweed leaves look hairy. The flowers on the plant are also useful for ragweed identification.