North America Native Plant

Southern Quillwort

Botanical name: Isoetes flaccida

USDA symbol: ISFL

Life cycle: perennial

Habit: grass

Native status: Native to the lower 48 states  

Southern Quillwort: A Rare and Fascinating Aquatic Native Meet the southern quillwort (Isoetes flaccida), one of nature’s most intriguing yet overlooked aquatic natives. This perennial grass-like plant might not win any beauty contests, but it’s a living piece of botanical history that deserves our attention and protection. What Exactly Is ...

Rare plant alert!

Region: Alabama

Status: S3: Status is uncertain but is somewhere between the following rankings: Vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals ⚘ Critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘

Region: Alabama

Southern Quillwort: A Rare and Fascinating Aquatic Native

Meet the southern quillwort (Isoetes flaccida), one of nature’s most intriguing yet overlooked aquatic natives. This perennial grass-like plant might not win any beauty contests, but it’s a living piece of botanical history that deserves our attention and protection.

What Exactly Is a Southern Quillwort?

Don’t let the name fool you – southern quillwort isn’t actually a grass, despite its grass-like appearance. This fascinating plant belongs to an ancient group called quillworts, which are more closely related to ferns than to true grasses. Think of it as a botanical time capsule, representing a lineage that has survived since the age of dinosaurs.

The southern quillwort produces distinctive quill-shaped leaves that emerge directly from an underground stem, creating tufts that look remarkably similar to ornamental grasses. However, instead of producing flowers and seeds like most plants we’re familiar with, quillworts reproduce through spores – just like their fern cousins.

Where Does Southern Quillwort Call Home?

This native species has a limited range in the southeastern United States, naturally occurring in Alabama, Florida, and Georgia. As a true wetland specialist, southern quillwort thrives in consistently wet environments and is classified as an obligate wetland plant, meaning it almost always occurs in wetlands.

A Rare Treasure Worth Protecting

Here’s where things get serious: southern quillwort is considered vulnerable with a global conservation status of S3. In Alabama, it’s even more critically imperiled with an S1 status, meaning it’s at high risk of disappearing from the state entirely. This rarity makes every population precious and worthy of protection.

Is Southern Quillwort Beneficial in Gardens?

While southern quillwort won’t provide the showy blooms that attract butterflies and bees (remember, it doesn’t flower), it can play valuable roles in specialized garden settings:

  • Perfect for authentic wetland restoration projects
  • Adds unique texture and historical significance to water gardens
  • Helps stabilize soil in consistently wet areas
  • Contributes to biodiversity in native plant collections
  • Serves as an educational conversation starter about plant evolution

How to Identify Southern Quillwort

Spotting southern quillwort in the wild requires knowing what to look for:

  • Low-growing tufts of narrow, grass-like leaves
  • Leaves emerge directly from the base with no visible stem above ground
  • Typically grows in or at the edge of water
  • Leaves are usually 4-12 inches long
  • Often found in acidic wetlands, ponds, or slow-moving streams
  • May be submerged or emerging from saturated soil

Growing Southern Quillwort Responsibly

Given its vulnerable status, we strongly recommend against collecting southern quillwort from the wild. If you’re interested in growing this rare native, only obtain plants or spores from reputable native plant nurseries that can verify responsible sourcing. Better yet, consider supporting conservation efforts that protect existing populations in their natural habitats.

For those lucky enough to acquire responsibly sourced southern quillwort, remember that this plant demands consistently wet conditions – think bog garden wet, not just moist soil. It’s best suited for USDA hardiness zones 8-10 and requires specialized care that mimics its natural wetland environment.

The Bottom Line

Southern quillwort may not be the flashiest addition to your garden, but it’s an irreplaceable piece of our natural heritage. Whether you encounter it in the wild or consider it for a specialized water garden, remember that you’re looking at a survivor from an ancient world – and one that needs our help to keep surviving in the modern one.

Southern 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 flaccida Shuttlw. ex A. Braun - southern quillwort

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