North America Non-native Plant

Wildrye

Botanical name: Elymus pendulina

USDA symbol: ELPE5

Habit: grass

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

Synonyms: Roegneria pendulina Nevski (ROPE5)   

Wildrye (Elymus pendulina): A Mysterious Native Grass Worth Investigating If you’ve stumbled across the name Elymus pendulina while researching native grasses, you’ve discovered one of botany’s more elusive characters. This wildrye species sits quietly in the background of the grass world, known to science but rarely discussed in gardening circles. ...

Wildrye (Elymus pendulina): A Mysterious Native Grass Worth Investigating

If you’ve stumbled across the name Elymus pendulina while researching native grasses, you’ve discovered one of botany’s more elusive characters. This wildrye species sits quietly in the background of the grass world, known to science but rarely discussed in gardening circles. Let’s explore what we know about this mysterious grass and whether it deserves a spot in your landscape.

What Is Wildrye?

Elymus pendulina belongs to the wildrye genus, a group of perennial grasses that have quietly been doing their job in natural ecosystems for millennia. Also known by its synonym Roegneria pendulina, this grass falls into that wonderful category of graminoids – the grass and grass-like plants that form the backbone of many natural landscapes.

Wildryes are typically bunch grasses, meaning they grow in clumps rather than spreading aggressively like some of their lawn-grass cousins. This growth habit makes them generally well-behaved in garden settings, though with Elymus pendulina specifically, documentation about its garden behavior is surprisingly scarce.

The Mystery of Geographic Distribution

Here’s where things get interesting – or frustrating, depending on your perspective. The geographic distribution of Elymus pendulina remains poorly documented in readily available sources. This could mean several things: it might have a very limited natural range, it could be a taxonomic name that’s fallen out of favor, or it might simply be one of those plants that hasn’t received much attention from researchers.

Should You Plant Wildrye in Your Garden?

The honest answer? It’s complicated. Without clear information about this species’ native status, growing requirements, or garden performance, it’s difficult to make a strong recommendation either way.

What We Don’t Know (And Why It Matters)

The lack of readily available information about Elymus pendulina raises several important questions:

  • Is it truly native to North America, and if so, where?
  • What growing conditions does it prefer?
  • How does it perform in cultivation?
  • What benefits does it provide to wildlife and pollinators?
  • Is it rare, common, or somewhere in between?

Better-Documented Wildrye Alternatives

If you’re interested in growing native wildryes, consider these well-documented alternatives that offer similar aesthetic appeal with proven garden performance:

  • Canada wildrye (Elymus canadensis) – A tall, graceful native with excellent wildlife value
  • Virginia wildrye (Elymus virginicus) – Adaptable to various conditions and great for woodland gardens
  • Blue wildrye (Elymus glaucus) – Beautiful blue-green foliage perfect for western gardens

These species have well-established track records in native plant gardens and clear cultivation guidelines.

The Takeaway

Elymus pendulina represents one of botany’s interesting mysteries – a named species that exists in the scientific literature but remains largely undocumented in practical gardening resources. While this doesn’t necessarily mean it’s a poor garden choice, it does mean you’d be gardening in uncharted territory.

For most gardeners, choosing well-documented native alternatives from the same genus offers the best of both worlds: the ecological benefits of native grasses with the confidence that comes from proven garden performance. Sometimes the most adventurous gardening choice is actually the most practical one.

If you do encounter Elymus pendulina in the wild or through specialized native plant sources, observe its growing conditions and behavior carefully – you might become one of the first to document its garden potential!

Wildrye

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 pendulina (Nevski) Tzvel. - wildrye

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