Nelson's horsetail
- kingdom: Plantae
- phylum: Tracheophyta
- class: Equisetopsida
- order: Equisetales
- family: Equisetaceae
- genus: Equisetum
- species: Equisetum nelsonii
Roxborough Park
Colorado- Evanston
Illinois
United States
Nelson's horsetail Roxborough Park Evanston