Once again, thank you to David Tarrant for sending along images of a species poorly-documented on the web.
The Mexican common name for this species is palocote. It is often considered an agricultural weed, and is indeed featured on the Weeds of Mexico site (with a series of photographs): Tithonia tubiformis. An illustration of the species is also online, via Missouri Botanical Garden’s Rare Books scanning project.
Epianthropochory. It’s a new word for me. It means dispersal of seeds by and on humans (think burrs or seeds with awns that get stuck on socks or shoelaces). Tithonia tubiformis is listed as one of the species that uses these methods in Vibrans, H. 1999. Epianthropochory in Mexican weed communities. American Journal of Botany. 86:476-481. If you shy away from reading the scientific papers I occasionally suggest as resources, I suggest giving this one a try as I think you’ll find it quite readable (and interesting). The paper discusses the prevalence and distribution of large adhesive-fruited weeds in agricultural areas of Mexico, and culminates with questions about the origin and evolution of these species.