North America Native Plant

Quillwort

Botanical name: Isoetes ×jeffreyi

USDA symbol: ISJE2

Life cycle: perennial

Habit: grass

Native status: Native to Canada  

Meet the Mysterious Quillwort: Nature’s Underwater Time Traveler Have you ever heard of a plant that looks like underwater grass but is actually more closely related to ancient ferns? Meet Isoetes ×jeffreyi, commonly known as quillwort – a fascinating aquatic plant that’s been quietly thriving in Canadian waters for who ...

Meet the Mysterious Quillwort: Nature’s Underwater Time Traveler

Have you ever heard of a plant that looks like underwater grass but is actually more closely related to ancient ferns? Meet Isoetes ×jeffreyi, commonly known as quillwort – a fascinating aquatic plant that’s been quietly thriving in Canadian waters for who knows how long. This isn’t your typical garden plant, but it’s definitely worth knowing about!

What Exactly Is a Quillwort?

Quillworts are some of nature’s most interesting botanical puzzles. Despite looking like simple grass growing underwater, they’re actually lycopods – ancient plants that reproduce through spores rather than seeds or flowers. Think of them as living fossils that have mastered the art of aquatic life. Isoetes ×jeffreyi is a hybrid species, which means it’s the result of two different quillwort species getting together and creating something new.

This perennial plant has a grass-like appearance that might fool you at first glance, but it’s playing by completely different rules than the lawn grass in your backyard.

Where Can You Find This Aquatic Wonder?

Isoetes ×jeffreyi calls Canada home, specifically making its residence in Ontario and Quebec. As a native species, it has earned its place in the local ecosystem through countless years of adaptation to the unique conditions of Canadian waterways.

Is Quillwort Beneficial for Gardens?

Here’s where things get interesting – and a bit tricky. Unlike your typical garden plants, quillworts aren’t really suited for traditional landscaping. They’re specialized aquatic plants that need very specific conditions to thrive. However, if you have a natural pond, water garden, or are involved in aquatic habitat restoration, understanding quillworts can be valuable.

These plants play important ecological roles in their aquatic environments, though they won’t attract pollinators since they don’t produce flowers. Instead, they contribute to underwater ecosystems in ways that are still being studied by botanists.

How to Identify a Quillwort

Spotting a quillwort requires knowing what to look for:

  • Grass-like leaves that emerge from the base of the plant
  • Typically found growing underwater or in very wet conditions
  • Leaves are usually narrow and can appear almost needle-like
  • No visible flowers (remember, they reproduce through spores!)
  • Often forms small clusters or patches in suitable habitat

The Bottom Line on Quillworts

While Isoetes ×jeffreyi isn’t destined for your flower borders or vegetable garden, it represents something special in the plant world. As a native Canadian species, it’s part of the country’s natural heritage. If you’re lucky enough to spot one during your nature adventures in Ontario or Quebec, take a moment to appreciate this ancient lineage that has survived countless environmental changes.

For most gardeners, quillworts will remain fascinating plants to learn about rather than grow. But isn’t it wonderful to know that such unique botanical treasures are quietly thriving in waterways, carrying on traditions that began millions of years ago?

Quillwort

Classification

Group

Quillwort

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision
Division

Lycopodiophyta - Lycopods

Subdivision
Class

Lycopodiopsida

Subclass
Order

Isoetales

Family

Isoetaceae Dumort. - Quillwort family

Genus

Isoetes L. - quillwort

Species

Isoetes ×jeffreyi D.M. Britton & D.F. Brunton - quillwort

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA