| https://www.flickr.com/photos/macleaygrassman/34283301252 Photographer: Harry Rose |
| https://commons.wikimedia.org/wiki/File:Xanthium_spinosum_-_staminate_flowers.JPG Photographer: Eitan F |
| https://www.flickr.com/photos/cimmyt/5072178080 Photographer: CIMMTY Images |
