North America Non-native Plant

Tripsacum Australe

Botanical name: Tripsacum australe

USDA symbol: TRAU9

Habit: grass

Native status: Not native but doesn't reproduce and persist in the wild

Tripsacum australe: A Mysterious Native Grass Worth Investigating If you’ve stumbled across the name Tripsacum australe while researching native grasses, you’re not alone in finding limited information about this particular species. This grass belongs to the Tripsacum genus, a group of robust grasses in the Poaceae family that are generally ...

Tripsacum australe: A Mysterious Native Grass Worth Investigating

If you’ve stumbled across the name Tripsacum australe while researching native grasses, you’re not alone in finding limited information about this particular species. This grass belongs to the Tripsacum genus, a group of robust grasses in the Poaceae family that are generally native to the Americas.

What We Know About This Graminoid

Tripsacum australe is classified as a graminoid, which means it’s a grass or grass-like plant. The genus Tripsacum includes several species of sturdy, perennial grasses that typically serve important ecological roles in their native habitats. However, specific information about T. australe itself is quite limited in botanical literature.

The Challenge with Identification

Here’s where things get a bit tricky for us gardening enthusiasts. While the name Tripsacum australe exists in some databases, detailed information about its native range, growing requirements, and garden characteristics isn’t readily available. This could mean a few things:

  • It might be a regional variant or subspecies that hasn’t been extensively studied
  • The name might be outdated or synonymous with another species
  • It could be a very localized species with limited distribution

Better-Known Alternatives to Consider

If you’re interested in growing native Tripsacum grasses, you might want to consider these well-documented alternatives:

  • Eastern Gamagrass (Tripsacum dactyloides) – A tall, robust native grass perfect for prairie gardens and erosion control
  • Florida Gamagrass (Tripsacum floridanum) – Better suited for southeastern gardens with its heat tolerance

What This Means for Your Garden

Without clear information about T. australe’s growing requirements, hardiness zones, or garden performance, it’s difficult to recommend it for specific landscape uses. If you’re determined to grow this particular species, you’ll want to:

  • Consult with local native plant societies
  • Contact botanical gardens in your region
  • Reach out to university extension services
  • Verify the plant’s identity with a botanist

The Takeaway

While the mystery surrounding Tripsacum australe makes it intriguing, it also makes it impractical for most home gardeners. Your best bet is to explore the better-documented species in the Tripsacum genus, which offer proven benefits for wildlife habitat, erosion control, and prairie-style landscaping. Sometimes in the gardening world, the most reliable path leads to the most rewarding results!

Have you encountered this elusive grass species in your local area? We’d love to hear about your experiences with any Tripsacum species in the comments below.

Tripsacum Australe

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

Poaceae Barnhart - Grass family

Genus

Tripsacum L. - gamagrass

Species

Tripsacum australe H.C. Cutler & E.S. Anderson

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