 | 1101-25. Blooming giant ragweed (Ambrosia trifida) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 1, 2012Similar picturesSmall thumbnails | Use large thumbnails | View as slideshow |
| 1101-25. Blooming giant ragweed (Ambrosia trifida) in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 1, 2012Similar picturesSmall thumbnails | Use large thumbnails | View as slideshow |
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