North America Native Plant

Ulihi Phyllostegia

Botanical name: Phyllostegia glabra var. lanaiensis

USDA symbol: PHGLL2

Life cycle: perennial

Habit: forb

Native status: Native to Hawaii  

Synonyms: Phyllostegia lanaiensis (Sherff) H. St. John (PHLA31)   

Ulihi Phyllostegia: A Rare Hawaiian Treasure Worth Protecting Meet the ulihi phyllostegia, a remarkable Hawaiian native plant that’s as rare as it is special. This endangered perennial herb represents one of Hawaii’s most precious botanical treasures, and understanding its story helps us appreciate the delicate balance of island ecosystems. What ...

Rare plant alert!

Region: United States

Status: S3TH: Status is uncertain but is somewhere between the following rankings: Vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals ⚘ Endangered: In danger of extinction throughout all or a significant portion of its range. ⚘

Region: United States

Ulihi Phyllostegia: A Rare Hawaiian Treasure Worth Protecting

Meet the ulihi phyllostegia, a remarkable Hawaiian native plant that’s as rare as it is special. This endangered perennial herb represents one of Hawaii’s most precious botanical treasures, and understanding its story helps us appreciate the delicate balance of island ecosystems.

What Makes Ulihi Phyllostegia Special?

The ulihi phyllostegia (Phyllostegia glabra var. lanaiensis) is a member of the mint family that grows as a perennial forb – think of it as a soft-stemmed herbaceous plant rather than a woody shrub. This native Hawaiian species has adapted specifically to the unique conditions of the Hawaiian Islands over thousands of years.

You might also see this plant referenced by its scientific synonym, Phyllostegia lanaiensis, in older botanical literature, but both names refer to the same remarkable species.

Where Does It Call Home?

This special plant is found exclusively in Hawaii, making it what botanists call an endemic species. Like many Hawaiian natives, the ulihi phyllostegia has evolved in isolation, developing characteristics found nowhere else on Earth.

A Plant in Peril

Here’s where the story takes a serious turn: the ulihi phyllostegia is currently listed as Endangered. This conservation status means the species faces a high risk of extinction in the wild. For perspective, this plant is rarer than many animals we consider critically threatened.

The rarity of this species makes it both incredibly valuable for conservation and challenging for home gardeners to obtain or grow.

Should You Plant Ulihi Phyllostegia?

If you’re lucky enough to live in Hawaii and passionate about native plant conservation, supporting the ulihi phyllostegia could be meaningful work. However, there are important considerations:

  • Only source plants from reputable native plant societies or conservation organizations
  • Never collect plants from the wild – this could push the species closer to extinction
  • Work with local botanists or extension services to ensure proper growing conditions
  • Consider this plant as part of a broader commitment to Hawaiian native landscaping

Growing Challenges and Unknowns

Unfortunately, detailed growing information for ulihi phyllostegia is limited, partly due to its rarity and the fact that most efforts focus on conservation rather than cultivation. What we do know is that as a native Hawaiian forb, it likely requires:

  • Specific soil conditions that mimic its natural habitat
  • Appropriate moisture levels
  • Protection from invasive species that threaten native Hawaiian plants
  • Possibly specialized care that amateur gardeners might find challenging

Supporting Conservation Without Growing

Even if growing ulihi phyllostegia isn’t practical for your situation, you can still support Hawaiian native plant conservation by:

  • Choosing other native Hawaiian plants for your landscape
  • Supporting organizations working to protect endangered Hawaiian species
  • Learning about and sharing the importance of native plant conservation
  • Avoiding invasive plants that compete with natives

The Bigger Picture

The ulihi phyllostegia represents more than just one rare plant – it’s a symbol of Hawaii’s unique natural heritage. Every endemic species that disappears represents thousands of years of evolutionary history lost forever. By understanding and caring about plants like the ulihi phyllostegia, we become part of the solution to preserving Hawaii’s incredible biodiversity.

While this particular species might not be the easiest addition to your garden, its story reminds us why native plants matter and why supporting conservation efforts – whether through responsible gardening choices or direct support of botanical conservation – makes a real difference in preserving our natural world for future generations.

Ulihi Phyllostegia

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

Lamiales

Family

Lamiaceae Martinov - Mint family

Genus

Phyllostegia Benth. - phyllostegia

Species

Phyllostegia glabra (Gaudich.) Benth. - ulihi phyllostegia

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