• Isoetes hyemalis (evergreen quillwort) | USDA PLANTS Database (About This Site)
• Isoetes hyemalis | Biota of North America Project (BONAP) (About This Site)
• Isoetes hyemalis D.F.Brunt. | Plants of the World Online (POWO) (About This Site)
• Isoetes hyemalis | NatureServe Explorer (About This Site)