North America Native Plant

El Yunque Jacanillo

Botanical name: Wallenia yunquensis

USDA symbol: WAYU

Life cycle: perennial

Habit: shrub

Native status: Native to Puerto Rico  

Synonyms: Petesioides yunquensis (Urb.) Britton (PEYU)   

El Yunque Jacanillo: A Rare Puerto Rican Native Worth Knowing About If you’re passionate about native plants and happen to be gardening in tropical climates, you might have stumbled across the name el yunque jacanillo. This intriguing shrub, scientifically known as Wallenia yunquensis, represents one of Puerto Rico’s unique endemic ...

El Yunque Jacanillo: A Rare Puerto Rican Native Worth Knowing About

If you’re passionate about native plants and happen to be gardening in tropical climates, you might have stumbled across the name el yunque jacanillo. This intriguing shrub, scientifically known as Wallenia yunquensis, represents one of Puerto Rico’s unique endemic treasures – though it’s not exactly what you’d call garden-center material.

What is El Yunque Jacanillo?

El yunque jacanillo is a perennial shrub that calls Puerto Rico home – and only Puerto Rico. This multi-stemmed woody plant typically stays under 13-16 feet tall, making it a manageable size for most landscape applications. Like many shrubs, it usually develops several stems from near ground level, creating that classic bushy appearance we associate with understory plants.

You might also see this plant listed under its former scientific name, Petesioides yunquensis, if you’re digging through older botanical references.

Where Does It Come From?

This plant is endemic to Puerto Rico, meaning it evolved there and exists nowhere else naturally on Earth. The name gives away its likely origins – yunque refers to El Yunque, Puerto Rico’s famous rainforest. This suggests our little shrub is quite fond of those humid, tropical conditions that make the island’s interior so lush and green.

Should You Plant El Yunque Jacanillo?

Here’s where things get a bit complicated. While el yunque jacanillo would theoretically make a wonderful addition to native Puerto Rican gardens, there are some serious considerations:

  • Rarity concerns: As an endemic species with limited distribution, this plant may be quite rare in the wild
  • Limited availability: You’re unlikely to find this at your local nursery – or any nursery, for that matter
  • Cultivation mystery: There’s very little information available about how to successfully grow this plant in garden settings
  • Responsible sourcing: If you do encounter this plant, ensure it comes from ethically propagated stock, never wild-collected specimens

Growing Conditions and Care

While specific cultivation information is scarce, we can make some educated guesses based on its native habitat and botanical family:

  • Climate: Likely thrives in USDA zones 10-11 (tropical conditions)
  • Moisture: Probably appreciates consistent moisture, given its rainforest origins
  • Light: May prefer partial shade to filtered sunlight, typical of understory shrubs
  • Soil: Likely adaptable to various soil types, as indicated by its facultative wetland status

The Wetland Connection

Interestingly, el yunque jacanillo has what botanists call a facultative wetland status in the Caribbean region. This means it’s quite the flexible plant – equally happy in wetland conditions or well-drained areas. This adaptability could make it a valuable plant for gardeners dealing with variable moisture conditions.

Wildlife and Pollinator Value

Unfortunately, specific information about this plant’s wildlife benefits isn’t readily available. However, as a native Puerto Rican species, it likely evolved alongside local wildlife and could provide food or habitat for native insects, birds, or other creatures in its ecosystem.

The Bottom Line

El yunque jacanillo represents the fascinating world of endemic plants – species that exist nowhere else on Earth and often hold secrets we’re still discovering. While it’s not a plant you can easily add to your garden right now, it serves as a reminder of the incredible botanical diversity that exists in places like Puerto Rico.

If you’re gardening in tropical climates and want to support native plants, consider focusing on more readily available Puerto Rican natives while keeping an eye out for conservation efforts that might eventually make rare species like el yunque jacanillo available through responsible propagation programs.

Sometimes the most interesting plants are the ones that remain just out of reach – at least for now.

Wetland Status

The rule of seasoned gardeners and landscapers is to choose the "right plant for the right place" matching plants to their ideal growing conditions, so they'll thrive with less work and fewer inputs. But the simplicity of this catchphrase conceals how tricky plant selection is. While tags list watering requirements, there's more to the story.

Knowing a plant's wetland status can simplify the process by revealing the interaction between plants, water, and soil. Surprisingly, many popular landscape plants are wetland species! And what may be a wetland plant in one area, in another it might thrive in drier conditions. Also, it helps you make smarter gardening choices and grow healthy plants with less care and feeding, saving you time, frustration, and money while producing an attractive garden with greater ecological benefits.

Regions
Status
Moisture Conditions

Caribbean

FAC

Facultative - Plants with this status can occur in wetlands and non-wetlands

El Yunque Jacanillo

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Primulales

Family

Myrsinaceae R. Br. - Myrsine family

Genus

Wallenia Sw. - jacanillo

Species

Wallenia yunquensis (Urb.) Mez - el yunque jacanillo

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