Native Plants

Koolau Range Melicope

Melicope lydgatei

USDA symbol: MELY

perennial shrub

Hawaii: native

If you’re passionate about native Hawaiian plants and conservation, the Koolau Range melicope (Melicope lydgatei) might just capture your heart. This remarkable shrub represents one of Hawaii’s most precious botanical treasures – and unfortunately, one of its most endangered. The Koolau Range melicope is a perennial shrub that’s perfectly at ...

Koolau Range Melicope may be listed as rare in your area.
Global Conservation Status

Status: S1 | Critically imperiled: Typically 5 or fewer occurrences or under 1,000 remaining individuals.

United States

Status: Endangered | Endangered. In danger of extinction throughout all or a significant portion of its range.

Koolau Range Melicope: A Rare Hawaiian Treasure Worth Protecting

If you’re passionate about native Hawaiian plants and conservation, the Koolau Range melicope (Melicope lydgatei) might just capture your heart. This remarkable shrub represents one of Hawaii’s most precious botanical treasures – and unfortunately, one of its most endangered.

What Makes This Plant Special?

The Koolau Range melicope is a perennial shrub that’s perfectly at home in Hawaii’s lush mountain forests. As a multi-stemmed woody plant, it typically grows to heights of 13-16 feet, though it can vary depending on environmental conditions. What makes this plant truly special isn’t just its botanical characteristics – it’s the fact that you’re looking at a living piece of Hawaiian natural heritage.

Where Does It Come From?

This endemic Hawaiian species calls the Koolau Mountains on Oahu home, where it grows naturally in the island’s native forest ecosystems. You won’t find this plant anywhere else in the world – Hawaii is its one and only native range.

  • Species observed
  • No observations

The Reality Check: Why This Plant Needs Our Help

Here’s where things get serious. The Koolau Range melicope has a Global Conservation Status of S1, which means it’s critically imperiled. With typically five or fewer occurrences and very few remaining individuals (fewer than 1,000), this species is listed as Endangered in the United States. In other words, this isn’t just rare – it’s teetering on the edge of extinction.

Should You Grow It?

The short answer is: only if you can source it responsibly. If you’re considering adding this plant to your garden, please ensure you’re obtaining it through legitimate conservation programs, botanical gardens, or certified native plant nurseries. Never collect plants from the wild – every individual in nature is precious for the species’ survival.

What Role Can It Play in Your Garden?

If you’re lucky enough to obtain responsibly sourced Koolau Range melicope, it can serve several important purposes:

  • Anchor plant for native Hawaiian gardens
  • Conservation focal point in botanical collections
  • Educational specimen for demonstrating Hawaiian plant conservation
  • Part of habitat restoration projects

Growing Conditions and Care

This species has a wetland status of Facultative, meaning it can handle both wetland and non-wetland conditions. However, successful cultivation requires understanding its natural habitat preferences.

Ideal growing conditions include:

  • USDA Hardiness Zones 10-11 (tropical conditions)
  • Moist, well-draining soils
  • Partial shade mimicking forest understory conditions
  • Consistent moisture without waterlogging
  • Protection from strong winds and direct sun

Planting and Care Tips

Growing critically endangered plants requires extra attention to detail:

  • Plant in well-amended soil with good organic content
  • Provide consistent watering but ensure excellent drainage
  • Mulch around the base to retain moisture and suppress weeds
  • Monitor closely for any signs of stress or disease
  • Consider joining or supporting conservation groups working to protect this species

The Bigger Picture

While the Koolau Range melicope’s specific wildlife and pollinator benefits aren’t well-documented, native Hawaiian plants like this one play crucial roles in supporting endemic insects and maintaining ecosystem balance. By growing this plant responsibly, you’re not just adding an interesting specimen to your garden – you’re participating in conservation efforts that could help save a species from extinction.

The Bottom Line

The Koolau Range melicope represents both an incredible opportunity and a serious responsibility. If you have the chance to grow this rare endemic Hawaiian shrub, approach it with the respect and care it deserves. Always source responsibly, provide excellent care, and consider yourself a guardian of one of Hawaii’s most endangered botanical treasures. After all, gardening with rare natives isn’t just about what grows in your yard – it’s about what survives for future generations.

Melicope lydgatei is also known as...

Often we refer to plants by their common names. When shopping for plants the scientific name is the best way to positively identify the plant species you desire. But some plants have more than one name! While it doesn't happen often, nurseries might display one name while you're searching for another. Melicope lydgatei is also known as:

Pelea apoda | USDA symbol: PEAP
Pelea descendens | USDA symbol: PEDE9
Pelea lydgatei | USDA symbol: PELY
Pelea parvifolia var. apoda | USDA symbol: PEPAA
Pelea parvifolia var. sessilis | USDA symbol: PEPAS
Pelea semiternata | USDA symbol: PESE9

Why do some plants have more than one name? Over time plant species may be renamed for a few reasons:

  1. Botanists in different regions named the same plant without knowing it had already been classified.
  2. A species was reclassified after scientific advances in, for example, DNA analysis.
  3. Slight variations within a species are sometimes mistakenly identified as entirely new species.

Classification

Group: Dicot
Kingdom: Plantae - Plants
Subkingdom: Tracheobionta - Vascular plants
Superdivision: Spermatophyta - Seed plants
Division: Magnoliophyta - Flowering plants
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 lydgatei (Hillebr.) T.G. Hartley & B.C. Stone - Koolau Range melicope

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