North America Native Plant

Oahu Clermontia

Botanical name: Clermontia oblongifolia brevipes

USDA symbol: CLOBB

Life cycle: perennial

Habit: shrub

Native status: Native to Hawaii  

Oahu Clermontia: A Rare Hawaiian Treasure Worth Protecting Meet the Oahu clermontia (Clermontia oblongifolia brevipes), one of Hawaii’s most precious and endangered native plants. This remarkable shrub represents both the incredible biodiversity of the Hawaiian Islands and the urgent need for plant conservation. If you’re considering adding this beauty to ...

Rare plant alert!

Region: United States

Status: S3T1: Status is uncertain but is somewhere between the following rankings: Subspecies or variety is 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) ⚘ 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

Oahu Clermontia: A Rare Hawaiian Treasure Worth Protecting

Meet the Oahu clermontia (Clermontia oblongifolia brevipes), one of Hawaii’s most precious and endangered native plants. This remarkable shrub represents both the incredible biodiversity of the Hawaiian Islands and the urgent need for plant conservation. If you’re considering adding this beauty to your garden, there are some important things you need to know first.

What Makes This Plant Special?

The Oahu clermontia is a perennial shrub that’s exclusively native to Hawaii, making it a true island endemic. As a member of the bellflower family, this multi-stemmed woody plant typically grows less than 13-16 feet tall, though it can vary depending on environmental conditions. What makes it truly special, however, is its rarity – this plant is currently listed as Endangered, with a Global Conservation Status of S3T1.

Where Does It Come From?

This native Hawaiian beauty calls the island of Oahu home, where it has evolved over thousands of years to thrive in Hawaii’s unique ecosystem. Unfortunately, its natural habitat has become increasingly threatened, which is why you’ll rarely encounter this plant in the wild today.

Should You Grow Oahu Clermontia?

Here’s where things get important: while the Oahu clermontia would make a fascinating addition to any Hawaiian native plant garden, its endangered status means you need to approach this plant with extreme care and responsibility. If you’re passionate about growing this rare beauty, here’s what you need to consider:

  • Only source responsibly: Never collect plants from the wild. Only obtain plants from reputable native plant nurseries or conservation programs
  • Support conservation efforts: Consider donating to or volunteering with Hawaiian plant conservation organizations instead
  • Choose alternatives: Consider other native Hawaiian Clermontia species that may be less threatened

Growing Conditions and Care

While specific growing information for this exact subspecies is limited due to its rarity, Clermontia plants generally prefer:

  • Hawaiian climate conditions (challenging to replicate elsewhere)
  • Well-draining soil with good organic content
  • Protection from harsh winds
  • Consistent moisture without waterlogging

Due to the plant’s endangered status and specific habitat requirements, successfully growing Oahu clermontia requires expertise in Hawaiian native plant cultivation and should ideally be undertaken as part of conservation efforts rather than casual gardening.

A Plant Worth Protecting

The Oahu clermontia serves as a powerful reminder of Hawaii’s unique natural heritage and the importance of plant conservation. While it may not be the easiest plant to add to your garden, supporting its conservation and learning about Hawaiian native plants can be incredibly rewarding.

If you’re passionate about Hawaiian native plants, consider connecting with local conservation groups, native plant societies, or botanical gardens. They often have programs where you can learn about and help protect rare species like the Oahu clermontia while discovering other beautiful Hawaiian natives that might be more suitable for home cultivation.

Remember, every plant conservation success story starts with people who care. Whether you end up growing this rare beauty or simply spreading awareness about its plight, you’re contributing to the preservation of Hawaii’s incredible botanical heritage.

Oahu Clermontia

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

Clermontia Gaudich. - clermontia

Species

Clermontia oblongifolia Gaudich. - Oahu clermontia

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