North America Native Plant

Connarus Semidecandrus

Botanical name: Connarus semidecandrus

USDA symbol: COSE19

Native status: Native to Pacific Basin excluding Hawaii  

Connarus semidecandrus: A Rare Pacific Island Native You Probably Can’t Grow Ever stumble across a plant name that sounds like it belongs in a fantasy novel? Meet Connarus semidecandrus, a mysterious member of the plant kingdom that’s about as elusive as a unicorn in your backyard. This rare species calls ...

Connarus semidecandrus: A Rare Pacific Island Native You Probably Can’t Grow

Ever stumble across a plant name that sounds like it belongs in a fantasy novel? Meet Connarus semidecandrus, a mysterious member of the plant kingdom that’s about as elusive as a unicorn in your backyard. This rare species calls the remote Pacific islands home, and unless you happen to live in Palau, you’re unlikely to encounter this botanical enigma in person.

What Exactly Is Connarus semidecandrus?

Connarus semidecandrus belongs to the Connaraceae family, a group of plants that typically includes woody climbing vines and shrubs. Think of them as the botanical equivalent of that friend who’s always reaching for something just out of grasp – they love to climb and sprawl their way through tropical forests.

Unfortunately, this particular species is so rare and understudied that we know remarkably little about its specific characteristics, growth habits, or appearance. It’s like having a celebrity who’s so exclusive that even the paparazzi can’t get a good photo!

Where Does It Call Home?

This plant is native to the Pacific Basin, specifically documented in Palau, those gorgeous tropical islands located between the Philippines and Guam. If you’re not familiar with Palau, imagine pristine coral reefs, crystal-clear waters, and lush tropical vegetation – basically, paradise with a side of rare plants.

Why You Probably Won’t Be Growing This One

Here’s the thing about Connarus semidecandrus – it’s not exactly available at your local garden center, and for good reason:

  • It’s geographically restricted to a very specific Pacific island location
  • There’s virtually no cultivation information available
  • It’s likely adapted to very specific tropical island conditions
  • Seeds or plants are not commercially available
  • It may have conservation concerns due to its limited range

The Conservation Angle

Plants with such restricted distributions often face unique challenges. Island species can be particularly vulnerable to habitat loss, invasive species, and climate change. While we don’t have specific data on the conservation status of Connarus semidecandrus, its limited range suggests it could be at risk.

If you’re fascinated by rare plants and conservation, supporting organizations that protect Pacific island biodiversity is a great way to help species like this one continue to thrive in their natural habitats.

Alternatives for Your Garden

If you’re drawn to the mystique of rare climbing plants from the Connaraceae family, you might have better luck finding other members of this plant family that are more widely cultivated. However, for most North American gardeners, focusing on native climbing vines from your local area will give you the best results and support local ecosystems.

Consider these native climbing alternatives depending on your region:

  • Native honeysuckles (Lonicera species)
  • Wild grapes (Vitis species)
  • Native clematis varieties
  • American groundnut (Apios americana)

The Bottom Line

Connarus semidecandrus serves as a fascinating reminder of just how much biodiversity exists in our world’s remote corners. While you won’t be adding this rare Pacific island native to your garden anytime soon, knowing about species like this helps us appreciate the incredible variety of plant life on our planet.

Sometimes the most interesting plants are the ones we can’t grow – they remind us that nature still holds plenty of mysteries, even in our well-connected world. And who knows? Maybe someday, botanical researchers will unlock more secrets about this elusive climber from Palau.

Until then, we’ll just have to admire Connarus semidecandrus from afar and focus on the amazing native plants we can actually grow in our own backyards!

Connarus Semidecandrus

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Rosales

Family

Connaraceae R. Br. - Cannarus family

Genus

Connarus L.

Species

Connarus semidecandrus Jack

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