North America Non-native Plant

Elymus Repens Elongatiformis

Botanical name: Elymus repens elongatiformis

USDA symbol: ELREE

Habit: grass

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

Synonyms: Agropyron elongatiforme Drobow (AGEL6)   

Elymus repens elongatiformis: The Mysterious Grass Variety If you’ve stumbled across the name Elymus repens elongatiformis in your gardening research, you’re likely scratching your head wondering what exactly this plant is. Don’t worry – you’re not alone! This particular grass variety is something of a botanical mystery, with very limited ...

Elymus repens elongatiformis: The Mysterious Grass Variety

If you’ve stumbled across the name Elymus repens elongatiformis in your gardening research, you’re likely scratching your head wondering what exactly this plant is. Don’t worry – you’re not alone! This particular grass variety is something of a botanical mystery, with very limited information available even in scientific circles.

What We Know About This Elusive Grass

Elymus repens elongatiformis belongs to the grass family and is classified as a graminoid – that’s the fancy term for grass and grass-like plants. It’s also known by the synonym Agropyron elongatiforme Drobow, which gives us a clue that it’s related to the wheatgrass group of plants.

Here’s where things get interesting (and a bit concerning): this plant appears to be closely related to Elymus repens, commonly known as quackgrass or couch grass – a species that’s notorious for being highly invasive in many parts of North America.

The Geographic Mystery

Unfortunately, the native range and current distribution of Elymus repens elongatiformis remain unknown. Without clear information about where this plant naturally occurs, it’s difficult to determine whether it would be appropriate for native gardening projects.

Should You Plant It?

Here’s where we need to pump the brakes a bit. Given the extremely limited information available about this specific variety and its potential relationship to invasive quackgrass species, we’d strongly recommend proceeding with caution. Here’s why:

  • The parent species (Elymus repens) is considered highly invasive in many regions
  • Grasses can spread aggressively through underground rhizomes
  • Without clear native status information, you could inadvertently introduce a problematic species
  • Limited research means unknown ecological impacts

Better Native Alternatives

Instead of taking a risk with this mysterious grass, consider these well-documented native alternatives that can provide similar aesthetic and ecological benefits:

  • Native bunch grasses specific to your region
  • Little bluestem (Schizachyrium scoparium)
  • Buffalo grass (Poaceae family natives)
  • Regional sedges (Carex species)

If You Encounter This Plant

If you come across Elymus repens elongatiformis growing wild or being sold commercially, we’d recommend:

  • Contacting your local extension office for identification confirmation
  • Checking with native plant societies in your area
  • Consulting with local botanists or ecologists
  • Avoiding collection or cultivation until more information is available

The Bottom Line

Sometimes in the gardening world, mystery isn’t a good thing. With so many well-documented, beneficial native plants available, there’s really no need to gamble on a species with unknown characteristics and potential invasive tendencies. Stick with tried-and-true native species that will support your local ecosystem without risk.

When in doubt, choose plants with clear native credentials and well-understood growing habits. Your garden – and your local environment – will thank you for it!

Elymus Repens Elongatiformis

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

Elymus L. - wildrye

Species

Elymus repens (L.) Gould - quackgrass

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