North America Native Plant

Howell’s Quillwort

Botanical name: Isoetes howellii

USDA symbol: ISHO

Life cycle: perennial

Habit: grass

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

Howell’s Quillwort: A Mysterious Aquatic Native Worth Knowing Meet one of North America’s most intriguing yet overlooked native plants: Howell’s quillwort (Isoetes howellii). While you probably won’t be adding this unusual species to your backyard garden anytime soon, understanding what it is and where it grows can deepen your appreciation ...

Howell’s Quillwort: A Mysterious Aquatic Native Worth Knowing

Meet one of North America’s most intriguing yet overlooked native plants: Howell’s quillwort (Isoetes howellii). While you probably won’t be adding this unusual species to your backyard garden anytime soon, understanding what it is and where it grows can deepen your appreciation for the incredible diversity of native plant life in western North America.

What Exactly Is a Quillwort?

Despite its grass-like appearance, Howell’s quillwort isn’t actually a grass at all. It belongs to an ancient group of plants called lycophytes, which are more closely related to ferns than to flowering plants. Think of quillworts as living fossils – their relatives dominated Earth’s landscapes millions of years ago, long before dinosaurs appeared.

This perennial plant produces narrow, quill-like leaves that emerge from an underground base, creating small tufts that look remarkably similar to grass or sedges. But here’s the fascinating part: instead of producing flowers and seeds like most plants we’re familiar with, quillworts reproduce using spores, just like ferns and mosses.

Where You’ll Find Howell’s Quillwort

Howell’s quillwort calls the western regions of North America home, with populations scattered across British Columbia, California, Idaho, Montana, Oregon, Utah, and Washington. This native species has adapted to life in some pretty specific conditions – you’ll find it growing in shallow ponds, lake margins, and seasonal wetlands throughout these mountainous and coastal regions.

A True Water Lover

If there’s one thing to know about Howell’s quillwort, it’s that this plant is absolutely committed to wetland life. Classified as an obligate wetland species, it almost always occurs in areas with standing water or consistently saturated soils. You might spot it:

  • Partially submerged along pond and lake edges
  • In seasonal pools that fill with winter rains
  • Around natural springs and seeps
  • In mountain meadows with year-round moisture

Why This Plant Matters

While Howell’s quillwort might not provide nectar for butterflies or berries for birds, it plays important ecological roles in its wetland communities. Its presence often indicates healthy, clean water conditions, making it something of a natural water quality indicator. The plant also helps stabilize soil along water edges and provides microhabitat for small aquatic creatures.

For native plant enthusiasts, spotting a quillwort in the wild is like finding a piece of botanical history. These ancient plants connect us to Earth’s distant past and remind us how much diversity exists in the plant kingdom beyond the showy flowers that typically grab our attention.

Should You Try Growing It?

Here’s where we need to be realistic: Howell’s quillwort is definitely not your typical garden plant. This species requires very specific aquatic conditions that are nearly impossible to replicate in most home landscapes. It needs clean, cool water, specific soil types, and natural seasonal water level fluctuations.

Instead of trying to grow Howell’s quillwort, consider supporting it by:

  • Protecting natural wetland habitats where it grows
  • Supporting wetland conservation efforts in western states
  • Learning to identify it during hikes near ponds and lakes
  • Choosing other native wetland plants for rain gardens or bog gardens

Better Alternatives for Wet Gardens

If you’re inspired by Howell’s quillwort but want to create wetland habitat in your own landscape, consider these more garden-friendly native alternatives:

  • Native sedges and rushes for pond edges
  • Monkey flower for colorful wetland areas
  • Native iris species for dramatic foliage
  • Cardinal flower for attracting hummingbirds to wet spots

While you might never have Howell’s quillwort gracing your garden, knowing about this remarkable plant enriches our understanding of native biodiversity. Next time you’re exploring wetlands in the western states, keep an eye out for those modest tufts of narrow leaves – you might just spot one of nature’s most ancient survivors thriving in its watery home.

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

Arid West

OBL

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

Western Mountains, Valleys, and Coast

OBL

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

Howell’s 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 howellii Engelm. - Howell's quillwort

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