North America Native Plant

Ames’ Quillwort

Botanical name: Isoetes riparia var. amesii

USDA symbol: ISRIA

Life cycle: perennial

Habit: grass

Native status: Native to the lower 48 states  

Synonyms: Isoetes riparia Engelm. ex A. Braun var. reticulata (A.A. Eaton) Proctor (ISRIR2)  âš˜  Isoetes saccharata Engelm. var. amesii A.A. Eaton (ISSAA)   

Ames’ Quillwort: A Mysterious Native Water Plant Worth Knowing Meet Ames’ quillwort (Isoetes riparia var. amesii), one of nature’s most understated and fascinating native plants. If you’ve never heard of quillworts before, you’re not alone – these peculiar little plants are among the most overlooked members of our native flora, ...

Ames’ Quillwort: A Mysterious Native Water Plant Worth Knowing

Meet Ames’ quillwort (Isoetes riparia var. amesii), one of nature’s most understated and fascinating native plants. If you’ve never heard of quillworts before, you’re not alone – these peculiar little plants are among the most overlooked members of our native flora, despite being living fossils that have been around for millions of years.

What Exactly Is a Quillwort?

Don’t let the name fool you – quillworts aren’t related to grasses at all, despite their grass-like appearance. They’re actually ancient plants called lycophytes, more closely related to ferns than to true grasses. Think of them as botanical time travelers that give us a glimpse into what plant life looked like when dinosaurs roamed the Earth.

Ames’ quillwort is a perennial plant that forms small rosettes of narrow, quill-like leaves that emerge from a bulbous base. The leaves are typically 2-6 inches long and have a distinctive hollow, tube-like structure. Unlike flowering plants, quillworts reproduce through spores, making them quite different from most garden plants you’re familiar with.

Where You’ll Find This Native Treasure

This special variety of quillwort is native to the eastern United States and can be found naturally in eight states and the District of Columbia: Connecticut, Delaware, Maryland, Massachusetts, New Jersey, New York, Virginia, and Washington D.C. It’s part of our native botanical heritage in these regions.

Identifying Ames’ Quillwort in the Wild

Spotting Ames’ quillwort requires knowing where to look and what to look for:

  • Look for small rosettes of narrow, upright leaves growing in or near water
  • The leaves are hollow, stiff, and pointed – hence the quill in the name
  • Plants are typically found in shallow water, pond margins, or seasonally flooded areas
  • The base of the plant is bulb-like and often partially buried in mud or sediment
  • During certain seasons, you might notice darker areas near the leaf bases where spores are produced

Is Ames’ Quillwort Beneficial for Gardens?

While Ames’ quillwort won’t win any beauty contests, it does have some unique ecological benefits:

  • Provides habitat for small aquatic invertebrates
  • Helps stabilize muddy pond edges and wetland margins
  • Adds biodiversity to aquatic ecosystems
  • Serves as an indicator of healthy wetland conditions

However, this isn’t a plant for typical garden settings. Ames’ quillwort requires very specific conditions – namely, shallow water or consistently saturated soil – that most gardens simply can’t provide. It’s best appreciated in its natural wetland habitats or specialized bog gardens designed specifically for aquatic plants.

A Living Connection to Ancient Times

What makes Ames’ quillwort truly special isn’t its garden potential, but its incredible evolutionary story. These plants represent one of the oldest lineages of land plants still alive today. When you encounter one in the wild, you’re looking at a direct descendant of the plants that first colonized land hundreds of millions of years ago.

While you probably won’t be adding Ames’ quillwort to your flower beds anytime soon, it’s worth appreciating this humble native plant for what it represents: resilience, antiquity, and the quiet persistence of nature’s less flashy but equally important species.

Supporting Native Plant Diversity

If you’re interested in supporting native aquatic plants like Ames’ quillwort, consider:

  • Protecting existing wetland habitats in your area
  • Supporting wetland restoration projects
  • Learning to identify and appreciate these unique native species
  • Choosing appropriate native water plants for pond features if you have the right conditions

Sometimes the most important native plants are the ones we never notice – until we take the time to look a little closer. Ames’ quillwort might not be the showstopper of the plant world, but it’s a fascinating reminder of the incredible diversity of life that calls our native landscapes home.

Ames’ 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 riparia Engelm. ex A. Braun - shore quillwort

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