Riddell's groundsel
- kingdom: Plantae
- phylum: Tracheophyta
- class: Magnoliopsida
- order: Asterales
- family: Asteraceae
- genus: Senecio
- species: Senecio riddellii
Cheyenne Wells- Wheat Ridge
Colorado- Hays
Kansas- Clayton
New Mexico- Homestead Meadows South
Texas
United States