North America Native Plant

Kalalau Valley Stenogyne

Botanical name: Stenogyne campanulata

USDA symbol: STCA12

Life cycle: perennial

Habit: vine

Native status: Native to Hawaii  

Kalalau Valley Stenogyne: A Critically Endangered Hawaiian Treasure Meet the Kalalau Valley stenogyne (Stenogyne campanulata), one of Hawaii’s most precious and precarious native plants. This little-known perennial herb holds the distinction of being critically imperiled, making it both a botanical treasure and a conservation priority that deserves our utmost respect ...

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

Kalalau Valley Stenogyne: A Critically Endangered Hawaiian Treasure

Meet the Kalalau Valley stenogyne (Stenogyne campanulata), one of Hawaii’s most precious and precarious native plants. This little-known perennial herb holds the distinction of being critically imperiled, making it both a botanical treasure and a conservation priority that deserves our utmost respect and protection.

A Rare Hawaiian Native

Stenogyne campanulata is endemic to Hawaii, meaning it exists nowhere else on Earth. This remarkable plant calls the beautiful Hawaiian islands its only home, where it has evolved over millennia to thrive in very specific conditions. As a true native species, it plays an irreplaceable role in Hawaii’s unique ecosystem.

Currently, this species is found exclusively in Hawaii, with its very name honoring the famous Kalalau Valley on the island of Kauai.

Understanding Its Critical Status

Here’s where things get serious, fellow plant lovers. The Kalalau Valley stenogyne carries a Global Conservation Status of S1, which translates to Critically Imperiled. This means there are typically only five or fewer known locations where this plant exists, with fewer than 1,000 individual plants remaining in the wild. It’s also officially listed as Endangered, putting it in the same category as pandas and tigers in terms of conservation urgency.

What Makes This Plant Special

As a perennial forb herb, Stenogyne campanulata is a non-woody vascular plant that returns year after year. The species name campanulata hints at bell-shaped characteristics, suggesting this plant may produce charming bell-like flowers. Unlike shrubs or trees, this herb lacks significant woody tissue and keeps its growing points at or near ground level – a smart survival strategy in its native habitat.

Should You Grow Kalalau Valley Stenogyne?

This is where we need to have a heart-to-heart conversation. While the idea of growing such a rare and special plant might seem appealing, the reality is quite different. Here’s what you need to know:

  • Extreme rarity: With so few individuals left in the wild, every single plant counts toward the species’ survival
  • Specialized needs: This plant has evolved for very specific Hawaiian conditions that are nearly impossible to replicate elsewhere
  • Legal considerations: There may be restrictions on collecting or propagating endangered species
  • Ethical responsibility: Growing rare plants requires ensuring material is responsibly and legally sourced

If You’re Determined to Help

If you’re passionate about supporting this species, consider these alternatives:

  • Support conservation organizations working to protect Hawaiian native plants
  • Visit botanical gardens that specialize in Hawaiian native species conservation
  • Choose other native Hawaiian plants that are less imperiled for your garden
  • Advocate for habitat protection in Hawaii

Growing Conditions (For Conservation Purposes Only)

For those involved in legitimate conservation efforts, Stenogyne campanulata would require:

  • Tropical conditions similar to its native Hawaiian habitat
  • USDA hardiness zones 10-12
  • Specialized knowledge of Hawaiian native plant cultivation
  • Careful attention to the specific microclimate needs of Kalalau Valley

The Bottom Line

The Kalalau Valley stenogyne represents both the incredible diversity of Hawaiian flora and the urgent need for plant conservation. While most of us won’t be growing this species in our gardens, we can all play a role in its survival by supporting conservation efforts and choosing sustainable gardening practices.

Sometimes the most loving thing we can do for a plant is to admire it from afar and work to protect its natural habitat. The Kalalau Valley stenogyne is definitely one of those special plants that deserves our protection more than our possession.

Kalalau Valley Stenogyne

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

Stenogyne Benth. - stenogyne

Species

Stenogyne campanulata Weller & Sakai - Kalalau Valley stenogyne

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