North America Native Plant

Haupu Range Yellow Loosestrife

Botanical name: Lysimachia haupuensis

USDA symbol: LYHA6

Life cycle: perennial

Habit: shrub

Native status: Native to Hawaii  

Haupu Range Yellow Loosestrife: A Rare Hawaiian Treasure Meet the Haupu Range yellow loosestrife (Lysimachia haupuensis), one of Hawaii’s most elusive native plants. This perennial shrub represents the incredible botanical diversity that makes the Hawaiian Islands so special – and sadly, so vulnerable. Where in the World? This remarkable plant ...

Rare plant alert!

Region: Conservation status by state

Status: SHQ: Status is uncertain but is somewhere between the following rankings: Uncertain taxonomy: ⚘ Possibly Extinct: Known only from historical occurrences. Still some hope of rediscovery ⚘

Haupu Range Yellow Loosestrife: A Rare Hawaiian Treasure

Meet the Haupu Range yellow loosestrife (Lysimachia haupuensis), one of Hawaii’s most elusive native plants. This perennial shrub represents the incredible botanical diversity that makes the Hawaiian Islands so special – and sadly, so vulnerable.

Where in the World?

This remarkable plant calls only one place home: the beautiful Hawaiian Islands. As its common name suggests, it’s specifically associated with the Haupu Range area, making it incredibly geographically restricted. When we talk about endemic Hawaiian species, Lysimachia haupuensis is about as local as it gets!

What Does It Look Like?

Haupu Range yellow loosestrife grows as a perennial shrub, typically developing multiple stems that arise from or near the ground. Like many of its shrubby cousins, it usually stays under 13-16 feet tall, though it can occasionally stretch taller or develop a single stem depending on its growing conditions. The yellow loosestrife part of its name hints at its likely sunny-colored blooms, though detailed descriptions of its appearance are surprisingly scarce.

A Conservation Concern

Here’s where things get serious, folks. Lysimachia haupuensis carries a Global Conservation Status of SHQ, which essentially means its conservation status is undefined – and that’s rarely good news in the plant world. This classification typically indicates either extremely limited data about the species or populations so small that assessment is difficult.

What does this mean for gardeners? Simply put, this isn’t a plant you’re likely to find at your local nursery, and that’s probably for the best. Rare Hawaiian endemics like this one need our protection more than our cultivation.

Should You Grow It?

The short answer is: probably not, and here’s why:

  • Extreme rarity makes this plant potentially unavailable through normal channels
  • Limited growing information means success would be highly uncertain
  • Conservation concerns suggest these plants are better left in their native habitat
  • No documented horticultural use or garden performance data exists

If you’re passionate about Hawaiian native plants and somehow encounter responsibly sourced material from conservation programs, that’s a different story. But for most gardeners, supporting Hawaiian plant conservation through other means would be more appropriate.

Supporting Hawaiian Plant Conservation

Instead of trying to grow this rare beauty, consider:

  • Supporting Hawaiian native plant conservation organizations
  • Growing other Hawaiian natives that are more readily available
  • Learning about Hawaii’s unique flora to spread awareness
  • Visiting botanical gardens that specialize in Hawaiian plants

The Bigger Picture

Lysimachia haupuensis represents something precious: Hawaii’s unique evolutionary story written in leaves and stems. These endemic species evolved in isolation, creating plant communities found nowhere else on Earth. While we can’t all grow this particular rarity in our gardens, we can appreciate its role in Hawaii’s natural heritage and support efforts to protect it.

Sometimes the best thing we can do for a plant is simply let it be wild and wonderful in its native home. And who knows? Maybe future conservation efforts will help secure this yellow loosestrife’s future on the beautiful slopes of the Haupu Range.

Haupu Range Yellow Loosestrife

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Primulales

Family

Primulaceae Batsch - Primrose family

Genus

Lysimachia L. - yellow loosestrife

Species

Lysimachia haupuensis H. St. John - Haupu Range yellow loosestrife

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