North America Native Plant

Smallnut Fimbry

Botanical name: Fimbristylis microcarya var. tainanensis

USDA symbol: FIMIT

Life cycle: perennial

Habit: grass

Native status: Native to Pacific Basin excluding Hawaii  

Synonyms: Fimbristylis autumnalis (L.) Roem. & Schult. var. tainanensis (Ohwi) T. Koyama (FIAUT)  âš˜  Fimbristylis tainanensis Ohwi (FITA2)   

Smallnut Fimbry: A Pacific Island Native Worth Knowing About If you’re looking for native plants that connect your garden to the unique ecosystems of the Pacific Islands, you might want to learn about smallnut fimbry (Fimbristylis microcarya var. tainanensis). This perennial sedge represents the specialized plant life that has evolved ...

Smallnut Fimbry: A Pacific Island Native Worth Knowing About

If you’re looking for native plants that connect your garden to the unique ecosystems of the Pacific Islands, you might want to learn about smallnut fimbry (Fimbristylis microcarya var. tainanensis). This perennial sedge represents the specialized plant life that has evolved in some of the world’s most remote island locations.

What Is Smallnut Fimbry?

Smallnut fimbry is a grass-like perennial that belongs to the sedge family (Cyperaceae). Like other sedges, it’s not actually a true grass, but it shares that familiar, slender appearance that makes sedges such valuable additions to naturalistic landscapes. This particular variety has quite a scientific pedigree, with synonyms including Fimbristylis autumnalis var. tainanensis and Fimbristylis tainanensis.

Where Does It Come From?

This native plant calls the Pacific Basin home, specifically thriving in Guam and Palau. These tropical island environments have shaped its evolution, making it perfectly adapted to the unique conditions found in this part of the world.

Should You Grow Smallnut Fimbry?

Here’s where things get interesting – and a bit challenging. Smallnut fimbry is one of those plants that botanists know about, but gardeners rarely encounter. There’s limited information available about its specific horticultural needs, appearance, and garden performance. This makes it something of a mystery plant for most gardeners.

The Reality Check

If you’re gardening outside of Guam or Palau, smallnut fimbry probably isn’t the plant for you. Its extremely limited native range suggests it has very specific environmental requirements that would be difficult to replicate elsewhere. Even finding seeds or plants would likely be nearly impossible through normal gardening channels.

For Pacific Island Gardeners

If you’re lucky enough to be gardening in Guam or Palau, smallnut fimbry could be a wonderful addition to a native plant garden. As a perennial sedge, it likely offers:

  • Low-maintenance growth once established
  • Natural adaptation to local climate conditions
  • Support for local ecosystems and wildlife
  • Authentic representation of your area’s natural plant communities

Growing Conditions (Best Guess)

While specific growing information for this variety is scarce, most Pacific Island sedges typically prefer:

  • Warm, tropical conditions year-round
  • High humidity levels
  • Regular moisture (many sedges enjoy wet conditions)
  • Partial sun to full sun exposure

What About Alternatives?

If you’re drawn to the idea of growing native sedges but live outside the Pacific Islands, consider researching sedge species native to your specific region. Every area has its own wonderful sedge species that can provide similar ecological benefits and that grass-like texture in the landscape.

The Bottom Line

Smallnut fimbry is fascinating from a botanical perspective, representing the unique plant life of Pacific Island ecosystems. However, for most gardeners, it remains more of an interesting plant to learn about rather than one to actually grow. If you’re passionate about Pacific Island natives and happen to live in the right location, it could be worth seeking out – just don’t expect it to be easy to find!

Sometimes the most interesting plants are the ones that remind us just how diverse and specialized our planet’s flora really is, even if we can’t grow them all in our own backyards.

Smallnut Fimbry

Classification

Group

Monocot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Liliopsida - Monocotyledons

Subclass

Commelinidae

Order

Cyperales

Family

Cyperaceae Juss. - Sedge family

Genus

Fimbristylis Vahl - fimbry

Species

Fimbristylis microcarya F. Muell.

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