North America Native Plant

Merrilliodendron

Botanical name: Merrilliodendron

USDA symbol: MERRI

Native status: Native to Pacific Basin excluding Hawaii  

Merrilliodendron: A Rare Pacific Island Tree Worth Knowing If you’re passionate about unique tropical trees and have the right climate conditions, Merrilliodendron might just capture your gardening imagination. This distinctive Pacific island native brings a touch of botanical rarity to specialized tropical landscapes, though it’s definitely not a plant for ...

Merrilliodendron: A Rare Pacific Island Tree Worth Knowing

If you’re passionate about unique tropical trees and have the right climate conditions, Merrilliodendron might just capture your gardening imagination. This distinctive Pacific island native brings a touch of botanical rarity to specialized tropical landscapes, though it’s definitely not a plant for every garden.

What Is Merrilliodendron?

Merrilliodendron is a fascinating tree species native to the Pacific Basin, with documented populations in Palau. While it may not have widely recognized common names, this tree belongs to a small genus that represents some of the Pacific’s most unique botanical heritage. Think of it as one of those hidden gems of the plant world that serious tropical gardeners and botanical enthusiasts seek out.

Where Does It Grow Naturally?

This tree calls the tropical Pacific islands home, specifically thriving in Palau’s warm, humid climate. Its limited natural distribution makes it a special addition to any collection, representing the incredible plant diversity found on remote Pacific islands.

Should You Consider Growing Merrilliodendron?

Here’s the honest truth: Merrilliodendron is definitely a specialist’s plant. If you live in USDA zones 10-12 and love collecting unique tropical trees, this could be an exciting challenge. However, if you’re looking for an easy-care shade tree or live anywhere with cool winters, you’ll want to look elsewhere.

Consider growing it if you:

  • Live in a consistently tropical climate (zones 10-12)
  • Enjoy collecting rare or unusual plants
  • Have experience with tropical tree cultivation
  • Want to support Pacific island plant conservation

Skip it if you:

  • Experience any frost or cool temperatures
  • Prefer low-maintenance landscaping
  • Have limited space for large trees
  • Live outside tropical zones

Growing Conditions and Care

Successfully growing Merrilliodendron requires mimicking its native Pacific island environment as closely as possible. This means consistent warmth, high humidity, and protection from harsh conditions.

Essential growing requirements:

  • Temperature: Consistently warm, never below 60°F
  • Humidity: High humidity levels year-round
  • Soil: Well-draining but moisture-retentive tropical soil
  • Light: Bright, filtered light to partial sun
  • Protection: Shelter from strong winds and salt spray

Planting and Care Tips

Given its specialized needs, Merrilliodendron requires thoughtful placement and care. Choose a protected location in your tropical garden where it won’t be exposed to harsh winds or dramatic temperature fluctuations.

Water consistently to maintain soil moisture without waterlogging, and consider supplemental humidity if you’re growing it in a drier tropical location. Mulching around the base helps retain moisture and regulate soil temperature.

A Note About Sourcing

If you’re interested in growing Merrilliodendron, be sure to source plants or seeds responsibly from reputable botanical suppliers or conservation programs. Given its limited natural distribution, supporting ethical cultivation helps ensure this unique species remains available for future generations to appreciate.

The Bottom Line

Merrilliodendron represents the fascinating botanical diversity of Pacific islands, but it’s definitely a plant for specialized tropical gardens and dedicated collectors. If you have the right climate and growing conditions, it can be a rewarding addition that connects your garden to the unique ecosystems of the Pacific. Just remember—this isn’t a beginner’s plant, but for the right gardener in the right location, it’s a living piece of Pacific natural history.

Merrilliodendron

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Celastrales

Family

Icacinaceae Miers - Icacina family

Genus

Merrilliodendron Kaneh.

Species

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