North America Native Plant

Forest Bedgrass

Botanical name: Ichnanthus tenuis

USDA symbol: ICTE

Life cycle: annual

Habit: grass

Native status: Native to Puerto Rico  

Synonyms: Oplismenus tenuis J. Presl (OPTE4)   

Forest Bedgrass: A Native Puerto Rican Grass Worth Knowing If you’re passionate about native plants and happen to be gardening in Puerto Rico, you might have come across the name forest bedgrass. This unassuming native grass, scientifically known as Ichnanthus tenuis, represents one of those fascinating local species that deserves ...

Forest Bedgrass: A Native Puerto Rican Grass Worth Knowing

If you’re passionate about native plants and happen to be gardening in Puerto Rico, you might have come across the name forest bedgrass. This unassuming native grass, scientifically known as Ichnanthus tenuis, represents one of those fascinating local species that deserves more attention from native plant enthusiasts.

What Exactly is Forest Bedgrass?

Forest bedgrass is an annual grass that belongs to the diverse world of graminoids – that’s botanist-speak for grasses and grass-like plants. As its common name suggests, this species has historically been found in forested areas, likely forming part of the understory plant community in Puerto Rico’s native ecosystems.

You might also encounter this plant referenced by its synonym, Oplismenus tenuis, in older botanical literature. Like many native grasses, forest bedgrass has adapted to thrive in its specific island environment over thousands of years.

Where Does Forest Bedgrass Call Home?

This grass is exclusively native to Puerto Rico, making it a true island endemic. Its natural range is limited to this Caribbean island, where it has evolved alongside other native species to create unique plant communities.

Should You Consider Growing Forest Bedgrass?

Here’s where things get interesting – and a bit challenging. While forest bedgrass is undoubtedly a legitimate native species worthy of conservation and appreciation, there’s surprisingly little information available about cultivating it in garden settings. This isn’t uncommon with lesser-known native grasses that haven’t made the leap from wild species to horticultural subjects.

The Reality of Growing Lesser-Known Natives

If you’re determined to include forest bedgrass in your native Puerto Rican landscape, you’ll be venturing into relatively uncharted territory. Here’s what we know and don’t know:

  • Growing conditions: Specific soil, light, and moisture requirements are not well-documented
  • Propagation: Seed collection and germination methods haven’t been standardized
  • Garden performance: How it behaves in cultivated settings is largely unknown
  • Wildlife benefits: While likely beneficial to native wildlife, specific relationships aren’t documented

Alternative Approaches for Native Grass Enthusiasts

If you’re passionate about incorporating native grasses into your Puerto Rican landscape, consider starting with better-documented native species while keeping an eye out for forest bedgrass in its natural habitat. This approach allows you to:

  • Support native plant communities with proven garden performers
  • Contribute to citizen science by observing and documenting forest bedgrass in the wild
  • Connect with local botanists and native plant societies who might be working on conservation efforts

The Bigger Picture

Forest bedgrass represents something important in the native plant world – the vast number of species that exist in our ecosystems but haven’t yet been brought into cultivation. While we can’t provide a detailed growing guide for this particular grass, its existence reminds us of the incredible diversity of native plants waiting to be better understood and appreciated.

If you encounter forest bedgrass in Puerto Rico’s natural areas, take a moment to appreciate this unique native grass. And who knows? Maybe you’ll be inspired to contribute to our understanding of how to successfully grow and conserve this interesting island endemic.

For now, forest bedgrass remains more of a botanical curiosity than a garden staple – but that doesn’t make it any less valuable to Puerto Rico’s natural heritage.

Forest Bedgrass

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

Ichnanthus P. Beauv. - bedgrass

Species

Ichnanthus tenuis (J. Presl) Hitchc. & Chase - forest bedgrass

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