Native Plants

Woodland Islandmint

Haplostachys linearifolia

USDA symbol: HALI4

perennial subshrub

Hawaii: native

If you’re passionate about native Hawaiian plants, you may have heard whispers about a mysterious little herb called woodland islandmint (Haplostachys linearifolia). This unassuming perennial holds a bittersweet place in Hawaii’s botanical history – it’s a plant that may have already slipped away from us forever. Woodland islandmint is a ...

Woodland Islandmint may be listed as rare in your area.
Global Conservation Status

Status: SH | Possibly extinct: Known only from historical occurrences but still some hope of rediscovery.

Woodland Islandmint: A Vanishing Treasure of Hawaii’s Native Flora

If you’re passionate about native Hawaiian plants, you may have heard whispers about a mysterious little herb called woodland islandmint (Haplostachys linearifolia). This unassuming perennial holds a bittersweet place in Hawaii’s botanical history – it’s a plant that may have already slipped away from us forever.

What Makes Woodland Islandmint Special?

Woodland islandmint is a delicate perennial herb that belongs to Hawaii’s unique native flora. As a forb – basically a non-woody flowering plant – it grows close to the ground without developing the thick, woody stems you’d see on shrubs or trees. Think of it as nature’s way of creating a low-maintenance groundcover, perfectly adapted to island life.

This little plant produces narrow, linear leaves that give it a somewhat grass-like appearance from a distance. When it blooms, it sends up small spikes topped with tiny white to pale purple flowers – nothing flashy, but quietly beautiful in that understated way that many native plants master so well.

A Plant on the Brink

Here’s where the story takes a somber turn. Woodland islandmint carries a Global Conservation Status of SH – which stands for Possibly Extirpated. In plain English, this means scientists believe it might already be gone from the wild, known only from historical records and pressed specimens in herbarium collections. There’s still hope for rediscovery, but it’s been a long time since anyone has documented a living population.

This rarity status puts woodland islandmint in a category that requires our utmost respect and caution. If you’re thinking about growing native Hawaiian plants, this isn’t one you can simply order from a catalog or pick up at your local nursery.

Where It Once Called Home

Woodland islandmint was endemic to the Hawaiian Islands – meaning it existed nowhere else on Earth. Historical records show it once grew across multiple islands in the Hawaiian chain, though the exact details of its preferred habitats have been lost to time along with the living plants themselves.

  • Species observed
  • No observations

Growing Conditions and Care

While we can’t provide specific growing instructions for a plant that may no longer exist, we can make educated guesses based on its close relatives and typical Hawaiian native plant preferences. Woodland islandmint would likely have thrived in:

  • Well-draining soils that don’t stay waterlogged
  • Partial shade to full sun conditions
  • USDA hardiness zones 10-12 (tropical and subtropical climates only)
  • Protection from strong winds and salt spray

As a perennial herb, it would have been relatively low-maintenance once established, probably requiring minimal watering during dry spells and benefiting from occasional removal of spent flower heads.

The Conservation Reality

If you’re passionate about supporting Hawaiian native plants, woodland islandmint presents a complex situation. While we can’t recommend actively seeking out this plant for your garden due to its possibly extirpated status, there are meaningful ways to honor its memory:

  • Support botanical gardens and research institutions working on Hawaiian plant conservation
  • Choose other native Hawaiian plants that are still available and help prevent more species from reaching the same fate
  • Learn about habitat restoration efforts in Hawaii
  • If you ever encounter a plant you think might be woodland islandmint in the wild, contact local botanists immediately

Looking Forward While Remembering

The story of woodland islandmint serves as a powerful reminder of how quickly we can lose the irreplaceable pieces of our natural heritage. While we may not be able to grow this particular plant in our gardens, we can use its story as motivation to better protect and celebrate the native plants that are still with us.

Every native plant we choose to grow is a small act of conservation – a way of keeping these unique evolutionary stories alive for future generations. Woodland islandmint may be gone, but its legacy can live on in our commitment to preserving Hawaii’s remaining botanical treasures.

Haplostachys linearifolia 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. Haplostachys linearifolia is also known as:

Haplostachys linearifolia Sherff var. rosmarinifolia | USDA symbol: HALIR

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: Asteridae
Order: Lamiales
Family: Lamiaceae Martinov - Mint family
Genus: Haplostachys (A. Gray) Hillebr. - haplostachys

Species: Haplostachys linearifolia (Drake) Sherff - woodland islandmint

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