North America Native Plant

Bluntleaf Hayscented Fern

Botanical name: Dennstaedtia obtusifolia

USDA symbol: DEOB3

Life cycle: perennial

Habit: forb

Native status: Native to Puerto Rico  

Synonyms: Dennstaedtia ordinata (Kaulf.) T. Moore (DEOR3)   

Bluntleaf Hayscented Fern: A Rare Puerto Rican Native Worth Knowing Meet the bluntleaf hayscented fern (Dennstaedtia obtusifolia), a fascinating native fern species that calls Puerto Rico home. While you might not find this beauty at your local garden center, it’s worth learning about this unique member of the hay-scented fern ...

Bluntleaf Hayscented Fern: A Rare Puerto Rican Native Worth Knowing

Meet the bluntleaf hayscented fern (Dennstaedtia obtusifolia), a fascinating native fern species that calls Puerto Rico home. While you might not find this beauty at your local garden center, it’s worth learning about this unique member of the hay-scented fern family that adds to the incredible plant diversity of the Caribbean.

What Makes This Fern Special?

The bluntleaf hayscented fern is a perennial species that’s endemic to Puerto Rico, meaning it naturally occurs nowhere else in the world. This makes it a true botanical treasure of the island. As its name suggests, it belongs to the Dennstaedtia genus, which is known for ferns that release a sweet, hay-like fragrance when their fronds are crushed or disturbed.

Where You’ll Find It

This native fern is found exclusively in Puerto Rico, where it has adapted to the island’s unique climate and growing conditions. Its limited geographic distribution makes it a special part of Puerto Rico’s endemic flora.

Why Gardeners Should Care

While detailed cultivation information for Dennstaedtia obtusifolia is limited, here’s why this fern matters to the gardening community:

  • It represents the unique biodiversity of Puerto Rican ecosystems
  • As a native species, it likely supports local wildlife and contributes to ecological balance
  • It adds to our understanding of fern diversity in tropical environments
  • For Puerto Rican gardeners, it represents authentic local flora

Identification Tips

As a member of the hay-scented fern family, the bluntleaf hayscented fern likely shares some characteristics with its relatives:

  • Delicate, finely divided fronds
  • A pleasant, sweet fragrance when fronds are disturbed
  • Perennial growth habit
  • Typical fern reproduction via spores rather than seeds

A Note on Availability and Conservation

Given its limited range and the lack of widespread cultivation information, the bluntleaf hayscented fern is not commonly available in the nursery trade. If you’re a Puerto Rican gardener interested in native plants, it’s worth connecting with local botanical gardens, native plant societies, or conservation organizations to learn more about this species and whether it might be appropriate for native landscaping projects.

The Bigger Picture

While we may not all be able to grow Dennstaedtia obtusifolia in our gardens, learning about plants like this reminds us of the incredible diversity of the plant kingdom. Each region has its own unique native species that have evolved to thrive in specific conditions, and these plants play important roles in their local ecosystems.

For gardeners outside of Puerto Rico looking to incorporate native ferns, consider researching the Dennstaedtia species native to your area – you might discover your own local hay-scented fern that brings similar beauty and ecological benefits to your landscape.

Bluntleaf Hayscented Fern

Classification

Group

Fern

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision
Division

Pteridophyta - Ferns

Subdivision
Class

Filicopsida

Subclass
Order

Polypodiales

Family

Dennstaedtiaceae Lotsy - Bracken Fern family

Genus

Dennstaedtia Bernh. - hayscented fern

Species

Dennstaedtia obtusifolia (Willd.) T. Moore - bluntleaf hayscented fern

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