North America Native Plant

Maxon’s Tonguefern

Botanical name: Elaphoglossum maxonii

USDA symbol: ELMA3

Life cycle: perennial

Habit: forb

Native status: Native to Puerto Rico  

Synonyms: Elaphoglossum pteropus auct. non C. Chr. (ELPT)   

Discovering Maxon’s Tonguefern: A Rare Puerto Rican Native Meet Maxon’s tonguefern (Elaphoglossum maxonii), a fascinating little fern that calls Puerto Rico home. While you might not find this green gem at your local nursery, it’s worth knowing about this unique native species that adds to the incredible biodiversity of Puerto ...

Discovering Maxon’s Tonguefern: A Rare Puerto Rican Native

Meet Maxon’s tonguefern (Elaphoglossum maxonii), a fascinating little fern that calls Puerto Rico home. While you might not find this green gem at your local nursery, it’s worth knowing about this unique native species that adds to the incredible biodiversity of Puerto Rican forests.

What Exactly Is Maxon’s Tonguefern?

Don’t let the data fool you – despite some sources listing it as a forb, Maxon’s tonguefern is actually a true fern species. This perennial plant belongs to the Elaphoglossum genus, a group known for their distinctive tongue-shaped fronds (hence the common name tonguefern). Like other members of its family, this fern reproduces through spores rather than flowers or seeds.

Where to Find This Puerto Rican Native

Elaphoglossum maxonii is endemic to Puerto Rico, meaning it naturally occurs nowhere else on Earth. This makes it a special part of the island’s unique ecological heritage. The fern grows exclusively within Puerto Rico’s borders, contributing to the rich tapestry of native plant life that makes the island’s ecosystems so remarkable.

Is It Beneficial for Gardens?

While specific information about this fern’s garden benefits is limited due to its rarity, ferns in general offer several advantages to garden ecosystems:

  • Provide habitat and shelter for small wildlife
  • Help maintain soil moisture and prevent erosion
  • Add lush, green texture to shaded garden areas
  • Require no pollination services, making them low-maintenance additions

However, because Maxon’s tonguefern appears to be quite rare and specialized in its habitat requirements, it’s not commonly available for home gardening.

Supporting Puerto Rico’s Native Plant Heritage

Rather than attempting to cultivate this rare species, garden enthusiasts can support Puerto Rico’s native plant diversity by:

  • Choosing other readily available native Puerto Rican ferns for their gardens
  • Supporting conservation efforts for rare endemic species
  • Learning about and appreciating the unique flora that makes Puerto Rico special

If you’re lucky enough to encounter Maxon’s tonguefern in its natural habitat, take a moment to appreciate this special piece of Puerto Rico’s botanical heritage. Just remember to observe and photograph rather than disturb – rare native species like this one need our protection to thrive for future generations.

The Bottom Line

While Maxon’s tonguefern may not be destined for your garden bed, it serves as a wonderful reminder of the incredible diversity found in Puerto Rico’s native ecosystems. By learning about and protecting species like this one, we help preserve the natural heritage that makes each region unique and ecologically valuable.

Maxon’s Tonguefern

Classification

Group

Fern

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision
Division

Pteridophyta - Ferns

Subdivision
Class

Filicopsida

Subclass
Order

Polypodiales

Family

Dryopteridaceae Herter - Wood Fern family

Genus

Elaphoglossum Schott ex J. Sm. - tonguefern

Species

Elaphoglossum maxonii Underw. ex Morton - Maxon's tonguefern

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