North America Non-native Plant

Denham’s Melicope

Botanical name: Melicope denhamii

USDA symbol: MEDE17

Life cycle: perennial

Habit: tree

Native status: It's either native or not native in Pacific Basin excluding Hawaii  

Denham’s Melicope: A Hidden Gem from the Pacific Islands Meet Denham’s melicope (Melicope denhamii), a fascinating native tree that calls the tropical Pacific islands home. While this perennial beauty might not be a household name in gardening circles, it represents the unique flora that makes Pacific island ecosystems so special. ...

Denham’s Melicope: A Hidden Gem from the Pacific Islands

Meet Denham’s melicope (Melicope denhamii), a fascinating native tree that calls the tropical Pacific islands home. While this perennial beauty might not be a household name in gardening circles, it represents the unique flora that makes Pacific island ecosystems so special.

Where Does Denham’s Melicope Come From?

This native tree species naturally occurs in Guam and Palau, making it a true child of the Pacific Basin. As a native plant in these island environments, Denham’s melicope has evolved to thrive in the specific conditions found in these tropical island ecosystems.

What to Expect: Size and Growth

Don’t let the name fool you into thinking this is a small shrub! Denham’s melicope is actually a proper tree that typically reaches impressive heights of 13 to 16 feet or more. Like many tropical trees, it features a single main trunk, though environmental conditions can sometimes encourage a more multi-stemmed or compact growth pattern.

As a perennial woody plant, this species is built for the long haul, developing into a substantial presence in any landscape where it’s suited to grow.

Should You Plant Denham’s Melicope?

Here’s where things get interesting – and a bit mysterious. While Denham’s melicope represents authentic Pacific island biodiversity, detailed cultivation information for this specific species is quite limited. This presents both opportunities and challenges for gardeners:

  • For Pacific island gardeners: If you’re gardening in Guam, Palau, or similar tropical Pacific environments, this native tree could be an excellent choice for supporting local ecosystems
  • For other tropical gardeners: The lack of detailed growing information means you’d be somewhat pioneering in cultivation efforts
  • For temperate climate gardeners: This tropical native likely won’t survive in cooler climates

The Growing Challenge

One of the biggest hurdles with Denham’s melicope is the limited availability of specific growing guidance. We know it’s adapted to Pacific island conditions, which typically means:

  • Warm, tropical temperatures year-round
  • High humidity levels
  • Well-draining soils (as found on many Pacific islands)
  • Tolerance for salt air and coastal conditions

However, specific details about soil preferences, water requirements, sun exposure needs, and propagation methods remain unclear for this particular species.

A Note on Conservation

Given the limited information available about Denham’s melicope, it’s worth considering whether this species might be uncommon or rare in cultivation. If you’re interested in growing this plant, we’d recommend:

  • Sourcing plants only from reputable, ethical suppliers
  • Consulting with local botanical gardens or native plant societies in the Pacific region
  • Contributing to our knowledge base by documenting your growing experiences

The Bottom Line

Denham’s melicope represents the fascinating but often understudied flora of Pacific islands. While it may not be the easiest plant to research or obtain, it offers gardeners in appropriate climates a chance to grow something truly unique and ecologically meaningful.

If you’re gardening in the Pacific islands or similar tropical environments and you’re drawn to native species, Denham’s melicope could be worth investigating further. Just be prepared for some detective work along the way!

For those in other regions looking for similar tropical tree options, consider researching other Melicope species or native trees from your own area that might offer similar benefits with better-documented growing requirements.

Denham’s Melicope

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

Sapindales

Family

Rutaceae Juss. - Rue family

Genus

Melicope (J.R. Forst. & G. Forst.) T.G. Hartley & B.C. Stone - melicope

Species

Melicope denhamii (Seem.) T.G. Hartley - Denham's melicope

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