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Spiny-Spore Quillwort (Isoetes tenella Léman ex Desv.)

Also classified as Isoetes echinospora Durieu (Disputed, See Notes).

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Range - Expand

Native or Not Present

This tentative map is based on our own research. It may have limited data on Canada and/or Mexico, and there is some subjectivity in our assignment of plants as introduced vs. expanded. Read more in this blog post.


BONAP refers to this taxon as Isoetes echinospora Durieu, whereas POWO lists Isoetes echinospora Durieu as a species limited to Europe and Siberia and neither native nor found in North America. We were not able to reconcile this inconsistency.

We refer to this species as Isoetes tenella Léman ex Desv because this designation seems to have a broader consensus.

Isoetes tenella (spiny-spore quillwort) | USDA PLANTS Database (About This Site)

Spiny-Spore Quillwort | iNaturalist (About This Site)

Isoetes echinospora | Biota of North America Project (BONAP) (About This Site)