North America Native Plant

Quillwort

Botanical name: Isoetes ×fairbrothersii

USDA symbol: ISFA

Life cycle: perennial

Habit: grass

Native status: Native to the lower 48 states  

Discovering the Mysterious Fairbrothers’ Quillwort: A Rare Wetland Wonder Have you ever heard of a plant that looks like underwater grass but is actually more closely related to ancient ferns? Meet the quillwort, specifically the rare hybrid known as Isoetes ×fairbrothersii, or Fairbrothers’ quillwort. This fascinating little plant is one ...

Discovering the Mysterious Fairbrothers’ Quillwort: A Rare Wetland Wonder

Have you ever heard of a plant that looks like underwater grass but is actually more closely related to ancient ferns? Meet the quillwort, specifically the rare hybrid known as Isoetes ×fairbrothersii, or Fairbrothers’ quillwort. This fascinating little plant is one of nature’s more mysterious creations, and chances are, you’ve never encountered one in the wild—and that’s perfectly normal!

What Exactly Is a Quillwort?

Before we dive into this particular species, let’s clear up what a quillwort actually is. Despite their grass-like appearance, quillworts aren’t grasses at all. They’re actually lycophytes—ancient plants that reproduce through spores rather than seeds or flowers. Think of them as living fossils that have been quietly doing their thing for millions of years, long before flowering plants took over the world.

Quillworts get their name from their distinctive appearance: they look like a bundle of green quills or thick grass blades emerging from a central base. But unlike grass, these leaves are actually modified stems that contain chambers for storing spores.

Where Does Fairbrothers’ Quillwort Call Home?

This particular quillwort is native to the United States, but don’t expect to find it in your neighborhood pond. Isoetes ×fairbrothersii has an extremely limited range, currently known only from New Jersey. This makes it one of the rarer members of an already uncommon plant family.

Living Life in the Wetlands

True to its quillwort nature, Fairbrothers’ quillwort is what botanists call an obligate wetland species across all the regions where it might potentially grow. This means it almost always occurs in wetlands and requires permanently wet conditions to survive. You’ll find it in acidic ponds, bogs, and other aquatic environments where the water stays consistently present.

Is This Plant Right for Your Garden?

Here’s where we need to be honest: Fairbrothers’ quillwort is definitely not your typical garden plant. As a perennial wetland species with extremely specific habitat requirements, it’s more of a botanical curiosity than a landscaping choice. Unless you’re creating a specialized bog garden or naturalistic wetland habitat, this plant won’t thrive in conventional garden settings.

Even if you wanted to grow it, sourcing this rare hybrid would be nearly impossible through normal channels. It’s the kind of plant that’s primarily of interest to botanists, wetland restoration specialists, and the most dedicated aquatic plant enthusiasts.

Identifying Quillworts in the Wild

If you’re ever exploring wetland areas in New Jersey (or anywhere else), here’s how to spot a quillwort:

  • Look for clusters of narrow, grass-like leaves growing directly from the base
  • The leaves are typically rigid and emerge from underwater or very wet soil
  • They often form small, tufted clumps rather than spreading widely
  • The base of the plant is usually bulbous or swollen
  • They’re almost always found in or very near permanent water

The Role of Rare Plants in Our Ecosystems

While you probably won’t be planting Fairbrothers’ quillwort in your backyard, it’s worth appreciating these rare species for what they represent. Every plant, no matter how obscure, plays a role in its ecosystem. Quillworts help maintain the unique chemistry and ecology of their wetland homes, and they serve as indicators of healthy aquatic environments.

As a hybrid species with such a limited range, Isoetes ×fairbrothersii is particularly vulnerable to habitat loss and environmental changes. Its very existence reminds us of the incredible diversity hidden in our wetlands and the importance of protecting these often-overlooked ecosystems.

Better Alternatives for Water Gardens

If the idea of aquatic plants appeals to you but quillworts seem too challenging, consider these more garden-friendly native wetland plants:

  • Native sedges and rushes for pond edges
  • Wild iris species for seasonal color
  • Native water lilies for larger water features
  • Pickerel rush for vertical interest
  • Arrowhead plants for distinctive foliage

While Fairbrothers’ quillwort might not be destined for your garden, it’s a perfect example of the amazing plant diversity that exists right under our noses—or in this case, right under the water’s surface. Sometimes the most interesting plants are the ones we’ll never grow, but can still appreciate from afar.

Wetland Status

The rule of seasoned gardeners and landscapers is to choose the "right plant for the right place" matching plants to their ideal growing conditions, so they'll thrive with less work and fewer inputs. But the simplicity of this catchphrase conceals how tricky plant selection is. While tags list watering requirements, there's more to the story.

Knowing a plant's wetland status can simplify the process by revealing the interaction between plants, water, and soil. Surprisingly, many popular landscape plants are wetland species! And what may be a wetland plant in one area, in another it might thrive in drier conditions. Also, it helps you make smarter gardening choices and grow healthy plants with less care and feeding, saving you time, frustration, and money while producing an attractive garden with greater ecological benefits.

Regions
Status
Moisture Conditions

Atlantic and Gulf Coastal Plain

OBL

Obligate Wetland - Plants with this status almost always occurs in wetlands

Eastern Mountains and Piedmont

OBL

Obligate Wetland - Plants with this status almost always occurs in wetlands

Northcentral & Northeast

OBL

Obligate Wetland - Plants with this status almost always occurs in wetlands

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 ×fairbrothersii J.D. Montgom. & W.C. Taylor [engelmannii × lacustris] - quillwort

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