North America Native Plant

Waianae Range Lobelia

Botanical name: Lobelia monostachya

USDA symbol: LOMO3

Life cycle: perennial

Habit: shrub

Native status: Native to Hawaii  

Synonyms: Lobelia hillebrandii Rock var. monostachya (LOHIM)   

Waianae Range Lobelia: A Critically Endangered Hawaiian Treasure If you’ve stumbled across information about the Waianae Range lobelia (Lobelia monostachya), you might be wondering if this native Hawaiian plant could grace your garden. Well, here’s the thing – this isn’t a plant you can or should add to your home ...

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

Waianae Range Lobelia: A Critically Endangered Hawaiian Treasure

If you’ve stumbled across information about the Waianae Range lobelia (Lobelia monostachya), you might be wondering if this native Hawaiian plant could grace your garden. Well, here’s the thing – this isn’t a plant you can or should add to your home landscape, and there’s a very important reason why.

A Plant on the Brink

The Waianae Range lobelia is what botanists call critically imperiled – a fancy way of saying this plant is hanging on by a thread. With a Global Conservation Status of S1 and listed as Endangered, there are typically fewer than 1,000 individual plants left in the wild, possibly much fewer. This makes it one of Hawaii’s rarest native plants.

Where It Calls Home

This perennial shrub is found exclusively in Hawaii, specifically endemic to the Waianae Mountains on the island of Oahu. It’s what we call a true Hawaiian original – it exists nowhere else on Earth naturally.

What Makes It Special

The Waianae Range lobelia grows as a multi-stemmed woody shrub, typically staying under 13-16 feet tall. Like other members of the lobelia family, it likely produces those distinctive tubular flowers that are so beloved by pollinators – though in this case, we’re talking about native Hawaiian pollinators that have co-evolved with this rare beauty.

Why You Shouldn’t Plant It (But Should Care About It)

Here’s where we need to have a heart-to-heart. Due to its critically endangered status, the Waianae Range lobelia should absolutely not be planted by home gardeners. Here’s why:

  • Any plants or seeds would need to come from wild populations, further threatening the species
  • We don’t fully understand its specific growing requirements
  • Conservation efforts need to be coordinated by professionals
  • Unauthorized cultivation could interfere with official recovery programs

How You Can Help Instead

Just because you can’t grow this plant doesn’t mean you can’t support it! Consider these alternatives:

  • Support Hawaiian native plant conservation organizations
  • Choose other native Hawaiian plants for your garden that aren’t endangered
  • Learn about and advocate for habitat protection in the Waianae Mountains
  • Participate in native plant restoration projects in your area

Better Choices for Your Hawaiian Garden

If you’re gardening in Hawaii and want to support native biodiversity, there are many other native Hawaiian plants that are more appropriate for home gardens. Look for species that are propagated through legitimate nurseries and conservation programs, not collected from the wild.

The Bigger Picture

The story of the Waianae Range lobelia is a reminder of how precious and fragile our native plant heritage can be. While we can’t bring this particular species into our gardens, we can honor it by making thoughtful choices about the plants we do grow and by supporting the dedicated people working to ensure species like this don’t disappear forever.

Sometimes the best way to love a plant is to admire it from afar and work to protect the wild places where it belongs.

Waianae Range Lobelia

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Campanulales

Family

Campanulaceae Juss. - Bellflower family

Genus

Lobelia L. - lobelia

Species

Lobelia monostachya (Rock) Lammers - Waianae Range lobelia

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