North America Native Plant

Chamisso’s Sandmat

Botanical name: Euphorbia chamissonis

USDA symbol: CHCH16

Life cycle: perennial

Habit: subshrub

Native status: Native to Pacific Basin excluding Hawaii  

Synonyms: Euphorbia chamissonis (Klotzsch & Garcke ex Klotzsch) Boiss. (EUCH14)   

Chamisso’s Sandmat: A Rare Pacific Islander You’ve Probably Never Heard Of Meet Chamisso’s sandmat (Euphorbia chamissonis), one of those mysterious native plants that makes you wonder if Mother Nature was keeping secrets. If you’ve never heard of this Pacific island native, don’t worry – you’re definitely not alone. This little-known ...

Chamisso’s Sandmat: A Rare Pacific Islander You’ve Probably Never Heard Of

Meet Chamisso’s sandmat (Euphorbia chamissonis), one of those mysterious native plants that makes you wonder if Mother Nature was keeping secrets. If you’ve never heard of this Pacific island native, don’t worry – you’re definitely not alone. This little-known perennial herb has managed to fly completely under the gardening radar, and there’s a pretty good reason for that.

What Exactly Is Chamisso’s Sandmat?

Chamisso’s sandmat is a perennial forb – basically a non-woody plant that comes back year after year. Think of it as the plant equivalent of that quiet person at the party who everyone forgets is there. It belongs to the Euphorbia family, which includes everything from dramatic poinsettias to quirky crown-of-thorns plants, though this particular species seems to have missed the memo about being showy.

In Palau, locals call it kerkar, which honestly sounds way cooler than its English name. Sometimes plants just get better treatment in their native languages!

Where Does It Actually Live?

This plant calls the Pacific Basin home, specifically hanging out in Guam and Palau. It’s native to these tropical island paradises, where it presumably enjoys the ocean breezes and sandy soils that give it the sandmat part of its name. Unfortunately, it’s not native to Hawaii, so don’t expect to spot it on your next Maui vacation.

The Great Mystery: Why We Know So Little

Here’s where things get interesting (and a bit frustrating for us plant nerds). Despite being a legitimate native species, Chamisso’s sandmat is practically a ghost in the gardening world. We’re talking about a plant with virtually no available information about:

  • What it actually looks like in detail
  • How big it gets
  • What growing conditions it prefers
  • Whether it attracts pollinators or wildlife
  • How to propagate it
  • What USDA zones it might survive in

It’s like trying to write a dating profile for someone you’ve only seen from across a crowded room – you know they exist, but that’s about it.

Should You Try to Grow Chamisso’s Sandmat?

This is where we need to pump the brakes a bit. While supporting native plants is always admirable, Chamisso’s sandmat presents some unique challenges:

The reality check: You probably can’t find this plant for sale anywhere. It’s not in nurseries, not in online catalogs, and definitely not at your local garden center. The lack of cultivation information suggests it’s either extremely rare, incredibly difficult to grow outside its native habitat, or both.

The responsible approach: If you’re somehow lucky enough to encounter seeds or plants, make absolutely sure they’re from ethical, sustainable sources. Given how little we know about its conservation status, we don’t want to contribute to any potential decline in wild populations.

Better Alternatives for Your Garden

Instead of chasing this botanical unicorn, consider other native Euphorbia species that are better documented and more readily available for your region. Many Euphorbia species are excellent drought-tolerant options that bring unique textures and forms to gardens.

If you’re specifically interested in Pacific island natives, research plants that are native to your actual location and have established cultivation guidelines. Your local native plant society or extension office can point you toward species that will thrive in your garden while supporting local ecosystems.

The Bottom Line

Chamisso’s sandmat is one of those plants that reminds us how much we still don’t know about the botanical world. While it’s fascinating that this species exists, quietly doing its thing on Pacific islands, it’s not realistically an option for most gardeners. Sometimes the best way to appreciate a native plant is simply knowing it exists and doing our part to protect the habitats where it naturally thrives.

For now, Chamisso’s sandmat remains nature’s little secret – and maybe that’s exactly how it likes it.

Chamisso’s Sandmat

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

Euphorbiales

Family

Euphorbiaceae Juss. - Spurge family

Genus

Chamaesyce Gray - sandmat

Species

Chamaesyce chamissonis (Klotzsch & Garcke ex Klotzsch) F.C. Ho - Chamisso's sandmat

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