North America Native Plant

Quillwort

Botanical name: Isoetes ×harveyi

USDA symbol: ISHA4

Life cycle: perennial

Habit: grass

Native status: Native to Canada âš˜ Native to the lower 48 states  

Synonyms: Isoetes tuckermanii A. Braun var. harveyi (A.A. Eaton) Clute (ISTUH)   

Harvey’s Quillwort: The Mysterious Aquatic Native You’ve Probably Never Heard Of If you’ve ever wondered what those tiny, grass-like tufts growing in shallow lake edges might be, you could be looking at one of nature’s most ancient plant families. Meet Harvey’s quillwort (Isoetes ×harveyi), a fascinating native aquatic plant that’s ...

Harvey’s Quillwort: The Mysterious Aquatic Native You’ve Probably Never Heard Of

If you’ve ever wondered what those tiny, grass-like tufts growing in shallow lake edges might be, you could be looking at one of nature’s most ancient plant families. Meet Harvey’s quillwort (Isoetes ×harveyi), a fascinating native aquatic plant that’s been quietly thriving in northeastern waters for millennia.

What Exactly Is a Quillwort?

Don’t let the name fool you – quillworts aren’t actually related to grasses at all! These perennial plants are living fossils, more closely related to ferns than to any grass you’d find in your lawn. Harvey’s quillwort is what botanists call a graminoid, meaning it has a grass-like appearance with its slender, quill-shaped leaves that emerge from an underground base.

This particular species is actually a hybrid (that’s what the × symbol means), and it reproduces through spores rather than flowers and seeds. Pretty cool for something that looks so simple, right?

Where You’ll Find This Native Gem

Harvey’s quillwort is a true northeastern native, calling both Canada and the northern United States home. You can find this aquatic plant growing naturally in New Brunswick, Nova Scotia, Ontario, Maine, and Newfoundland. It’s perfectly adapted to the cooler climates and pristine waters of this region.

What Makes This Plant Special?

Here’s where things get interesting – Harvey’s quillwort is what we call an obligate wetland species. This means it almost always lives in wetlands and simply can’t survive in dry conditions. You’ll typically spot it growing in:

  • Shallow lake margins
  • Pond edges
  • Slow-moving streams
  • Boggy areas with standing water

Is This Plant Right for Your Garden?

Here’s the honest truth – Harvey’s quillwort probably isn’t the plant for most home gardeners. This isn’t a showstopper that will wow your neighbors or attract butterflies to your flower beds. Instead, it’s a specialized aquatic plant that requires very specific conditions to thrive.

However, if you have a natural pond, bog garden, or are creating a specialized native aquatic habitat, this little plant could be a fascinating addition. Just keep in mind that it’s quite inconspicuous – you’ll need to look closely to appreciate its quiet beauty.

How to Identify Harvey’s Quillwort

Spotting this plant takes a keen eye since it’s pretty small and unassuming. Look for:

  • Clusters of thin, quill-like leaves emerging from the water or muddy substrate
  • Leaves that are typically 2-6 inches long
  • A grass-like appearance but growing in consistently wet conditions
  • Plants growing in shallow water, often partially submerged

Remember, if you do spot what you think might be Harvey’s quillwort in the wild, it’s best to observe and photograph rather than collect. These specialized aquatic habitats are delicate ecosystems that deserve our protection.

The Bottom Line

While Harvey’s quillwort might not be the star of your typical native plant garden, it represents something pretty amazing – a living connection to ancient plant lineages that have been quietly doing their thing in northeastern waters for countless generations. Sometimes the most interesting native plants are the ones that remind us there’s still so much mystery and wonder in the natural world, even in something as simple-looking as a small aquatic grass.

If you’re passionate about native aquatic plants and have the right conditions, this little quillwort could be a unique addition to a specialized water feature. Just remember – it’s all about creating the right wet, shallow-water environment where this ancient survivor can continue its quiet existence.

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

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 ×harveyi A.A. Eaton (pro sp.) [lacustris × truncata] - quillwort

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