Howell's quillwort
- kingdom: Plantae
- phylum: Tracheophyta
- class: Lycopodiopsida
- order: Isoetales
- family: Isoetaceae
- genus: Isoetes
- species: Isoetes howellii
Rancho Murieta- Sebastopol
California- Moscow
Idaho- Corvallis
- Hood River
- The Dalles
Oregon- Dallesport
- Spokane
Washington
United States
Castlegar