North America Native Plant

Hawai’i Alectryon

Botanical name: Alectryon macrococcus

USDA symbol: ALMA

Life cycle: perennial

Habit: tree

Native status: Native to Hawaii  

Hawai’i Alectryon: A Rare Hawaiian Treasure Worth Protecting Meet the Hawai’i alectryon (Alectryon macrococcus), one of Hawaii’s most endangered native trees that deserves a spotlight in conservation gardening. This stunning perennial tree species is more than just a pretty face – it’s a critically important piece of Hawaiian natural heritage ...

Rare plant alert!

Region: United States

Status: S1: Status is uncertain but is somewhere between the following rankings: Critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘ Endangered: In danger of extinction throughout all or a significant portion of its range. ⚘

Region: United States

Status: Endangered: Status is uncertain but is somewhere between the following rankings: Critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘ Endangered: In danger of extinction throughout all or a significant portion of its range. ⚘

Hawai’i Alectryon: A Rare Hawaiian Treasure Worth Protecting

Meet the Hawai’i alectryon (Alectryon macrococcus), one of Hawaii’s most endangered native trees that deserves a spotlight in conservation gardening. This stunning perennial tree species is more than just a pretty face – it’s a critically important piece of Hawaiian natural heritage that’s teetering on the edge of extinction.

A Tree with a Story to Tell

The Hawai’i alectryon is endemic to the Hawaiian Islands, meaning it exists nowhere else on Earth. This remarkable tree naturally occurs across several Hawaiian islands including the Big Island, Maui, Molokai, and Oahu, where it once thrived in native forests.

Unfortunately, this beautiful tree now carries the sobering designation of Critically Imperiled with a Global Conservation Status of S1. In the United States, it’s classified as Endangered, with typically only 5 or fewer occurrences remaining and fewer than 1,000 individual plants surviving in the wild.

What Makes This Tree Special

The Hawai’i alectryon is a true showstopper when it comes to aesthetic appeal. As a perennial woody tree, it typically grows 13-16 feet tall (though under certain conditions it may develop a shorter, multi-stemmed form). What really catches the eye are its compound leaves and spectacular fruit display – bright red to orange capsules that split open dramatically to reveal glossy black seeds adorned with vibrant red arils.

Garden and Landscape Role

If you’re fortunate enough to live in USDA hardiness zones 10-12 and can source this tree responsibly, it makes an exceptional:

  • Specimen tree for tropical and Hawaiian native gardens
  • Shade provider with unique character
  • Conservation showcase plant
  • Educational focal point about Hawaiian biodiversity

This tree is perfectly suited for Hawaiian native plant gardens, tropical landscapes focused on indigenous species, and botanical collections dedicated to conservation.

Growing Conditions and Care

The Hawai’i alectryon thrives in conditions that mimic its native Hawaiian habitat:

  • Well-draining soils (essential to prevent root rot)
  • Partial to full sun exposure
  • Moderate, consistent rainfall or irrigation
  • Protection from strong winds
  • Tropical to subtropical climates only (zones 10-12)

Planting and Care Tips

If you’re committed to growing this rare treasure, here’s what you need to know:

  • Provide consistent moisture during the establishment period
  • Apply organic mulch around the base to retain moisture and suppress weeds
  • Young trees may need staking for wind protection
  • Avoid overwatering – good drainage is crucial
  • Be patient – like many native Hawaiian plants, growth may be slow initially

Important Conservation Considerations

Here’s the crucial part: Due to its critically imperiled status, you should only plant Hawai’i alectryon if you can obtain it through responsible sources. This means purchasing from reputable native plant nurseries that propagate from legally collected seeds or participate in conservation programs – never collecting from wild populations.

By choosing to grow this endangered species, you’re not just adding a unique tree to your landscape; you’re participating in conservation efforts and helping preserve Hawaiian biodiversity for future generations.

Wildlife and Ecological Benefits

The Hawai’i alectryon plays an important role in supporting Hawaiian ecosystems. Its flowers provide nectar for native Hawaiian insects and some introduced pollinators, while the tree itself contributes to the structure and biodiversity of native Hawaiian forests.

The Bottom Line

The Hawai’i alectryon is absolutely worth growing if you live in the right climate and can source it responsibly. Yes, it requires specific growing conditions and comes with conservation responsibilities, but the reward is immense – you’ll be cultivating a living piece of Hawaiian natural history while contributing to the preservation of one of the world’s most endangered trees.

Just remember: with great plants comes great responsibility. Make sure your Hawai’i alectryon comes from legitimate conservation sources, and consider your garden a small sanctuary for this remarkable endangered species.

Hawai’i Alectryon

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

Sapindaceae Juss. - Soapberry family

Genus

Alectryon Gaertn. - alectryon

Species

Alectryon macrococcus Radlk. - Hawai'i alectryon

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