Missouri Plants Common ragweed   (Ambrosia artemisiifolia) Tracheophyta: Angiospermae: Dicot: Daisy (Asteraceae) Native North American plant Habitat: waste places, fields, roadsides. ID Features: lobed leaves, green flowers on spikes. Natural History: Common ragweed has lobed leaves and flowers born atop short spikes. Its pollen is a major contributor to hay fever. It produces green flowers that grow along the sides of short stalks.

The information is from: Missouri Wildflowers by Edgar Denison, 5th Edition, Missouri Department of Conservation, ©1998.