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Common Ragweed Asteraceae (Aster Family)
Description Distinguishing Features - Leaves: light green, up to 10 cm long. Flowers: male - small yellow-green, packed with yellow stamens, borne in heads of 15 to 20 florets each, arranged on elongated clusters 2.5 - 15 cm long, near top of plant; female - small, green, stalkless, borne in small clusters at leaf axils; flowering July to October. Fruit: small, top-shaped, capped with 6 short spines. Habitat Widespread throughout North America; in fields and roadsides. Notes The pollen of the Common Ragweed is a major cause of hay fever in allergy sufferers.
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A coarse, hairy-stemmed annual, growing to a height of 30 - 150 cm.