Ambrosia psilostachya Ragweed, Western Ragweed ID: 0000 0000 0103 0091 [detail] © 2003 Michelle Cloud-Hughes

Ambrosia psilostachya Western Ragweed ID: 0000 0000 1006 1268 [detail] © 2006 Adonis (Don) Tate

Ambrosia psilostachya Western Ragweed ID: 0000 0000 1006 1269 [detail] © 2006 Adonis (Don) Tate

Using these photos: A variety of organizations and individuals have contributed photographs to CalPhotos. Please follow the usage guidelines provided with each image. Use and copyright information, as well as other details about the photo such as the date and the location, are available by clicking on the [detail] link under the thumbnail. See also: Using the Photos in CalPhotos.