Native Plants

Splitleaf Cyanea

Cyanea grimesiana obatae

USDA symbol: CYGRO

perennial shrub

Hawaii: native

If you’ve stumbled across the splitleaf cyanea (Cyanea grimesiana obatae) in your plant research, you’ve discovered one of Hawaii’s most endangered botanical gems. This remarkable native Hawaiian plant tells a story of both incredible beauty and urgent conservation needs that every gardener should know about. The splitleaf cyanea is a ...

Splitleaf Cyanea may be listed as rare in your area.
Global Conservation Status

Status: S1T1 | Critically imperiled: Extremely rare. Typically 5 or fewer occurrences or under 1,000 remaining individuals.

United States

Status: Endangered | Endangered. In danger of extinction throughout all or a significant portion of its range.

Splitleaf Cyanea: A Critically Rare Hawaiian Treasure

If you’ve stumbled across the splitleaf cyanea (Cyanea grimesiana obatae) in your plant research, you’ve discovered one of Hawaii’s most endangered botanical gems. This remarkable native Hawaiian plant tells a story of both incredible beauty and urgent conservation needs that every gardener should know about.

What Makes Splitleaf Cyanea Special

The splitleaf cyanea is a perennial shrub that’s exclusively native to Hawaii, making it a true island endemic. This woody plant typically grows as a multi-stemmed shrub, usually staying under 13-16 feet in height. Like many Hawaiian natives, it has adapted to very specific island conditions over thousands of years.

You might also see this plant referenced by its botanical synonyms, including Cyanea grimesiana var. hirsutifolia and Cyanea grimesiana var. obovata, but these all refer to variations of the same critically rare species.

Where Does It Grow?

Splitleaf cyanea is found only in Hawaii, where it clings to existence in increasingly fragmented habitats. Its distribution is extremely limited, which brings us to a crucial point every gardener needs to understand.

  • Species observed
  • No observations

The Reality Check: Why You Shouldn’t Plant This

Here’s the important part that might surprise you: despite its beauty and native status, splitleaf cyanea is not a plant for your garden. This species carries an Endangered status and has a Global Conservation Status of S1T1, indicating it’s critically imperiled. In simple terms, this plant is hanging on by a thread in the wild.

Attempting to grow this species without proper authorization and expertise could actually harm conservation efforts. These plants require incredibly specialized growing conditions that are nearly impossible to replicate outside their native habitat.

What This Means for Gardeners

If you’re passionate about Hawaiian native plants (and live in an appropriate climate), there are several things you can do instead:

  • Support conservation organizations working to protect Hawaiian native plants
  • Choose other Hawaiian natives that are more suitable for cultivation
  • Visit botanical gardens that specialize in Hawaiian conservation to see these plants responsibly
  • Advocate for habitat protection in Hawaii

The Bigger Picture

While we can’t bring splitleaf cyanea into our gardens, understanding its story helps us appreciate the delicate balance of island ecosystems. Many Hawaiian native plants face similar challenges due to habitat loss, invasive species, and climate change.

As gardeners, we can honor plants like splitleaf cyanea by making thoughtful choices about what we grow, supporting conservation efforts, and spreading awareness about the importance of protecting rare native species where they naturally occur.

Growing Hawaiian Spirit in Your Garden

If the idea of Hawaiian natives appeals to you, focus on species that are more stable and appropriate for cultivation. Many botanical gardens and native plant societies can guide you toward Hawaiian plants that won’t contribute to conservation concerns.

Remember, sometimes the most loving thing we can do for a rare plant is to admire it from afar and support its protection in its natural home rather than trying to bring it into our own spaces.

Cyanea grimesiana obatae is also known as...

Often we refer to plants by their common names. When shopping for plants the scientific name is the best way to positively identify the plant species you desire. But some plants have more than one name! While it doesn't happen often, nurseries might display one name while you're searching for another. Cyanea grimesiana obatae is also known as:

Cyanea grimesiana var. hirsutifolia | USDA symbol: CYGRH
Cyanea grimesiana var. obovata | USDA symbol: CYGRO2

Why do some plants have more than one name? Over time plant species may be renamed for a few reasons:

  1. Botanists in different regions named the same plant without knowing it had already been classified.
  2. A species was reclassified after scientific advances in, for example, DNA analysis.
  3. Slight variations within a species are sometimes mistakenly identified as entirely new species.

Classification

Group: Dicot
Kingdom: Plantae - Plants
Subkingdom: Tracheobionta - Vascular plants
Superdivision: Spermatophyta - Seed plants
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida - Dicotyledons
Subclass: Asteridae
Order: Campanulales
Family: Campanulaceae Juss. - Bellflower family
Genus: Cyanea Gaudich. - cyanea

Species: Cyanea grimesiana Gaudich. - splitleaf cyanea

Subspecies: Cyanea grimesiana Gaudich. ssp. obatae (H. St. John) Lammers - splitleaf cyanea

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