North America Native Plant

Wedge Sandmat

Botanical name: Chamaesyce deltoidea deltoidea

USDA symbol: CHDED

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Synonyms: Euphorbia deltoidea Engelm. ex Chapm. (EUDE6)   

Wedge Sandmat: A Rare Florida Native Worth Protecting Meet the wedge sandmat (Chamaesyce deltoidea deltoidea), a tiny but mighty native plant that’s fighting for survival in the wilds of Florida. This unassuming little herb might not win any beauty contests, but it’s got something far more valuable – it’s a ...

Rare plant alert!

Region: United States

Status: S2T1: 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) ⚘ Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 6 to 20 occurrences or few remaining individuals (1,000 to 3,000) ⚘ Endangered: In danger of extinction throughout all or a significant portion of its range. ⚘

Region: United States

Wedge Sandmat: A Rare Florida Native Worth Protecting

Meet the wedge sandmat (Chamaesyce deltoidea deltoidea), a tiny but mighty native plant that’s fighting for survival in the wilds of Florida. This unassuming little herb might not win any beauty contests, but it’s got something far more valuable – it’s a piece of Florida’s natural heritage that desperately needs our help.

What Makes Wedge Sandmat Special?

Wedge sandmat is a perennial forb, which is just a fancy way of saying it’s a non-woody plant that comes back year after year. Don’t let the modest description fool you – this little survivor has been quietly holding down the fort in Florida’s challenging coastal environments for countless generations.

You might also see this plant listed under its scientific synonym, Euphorbia deltoidea, in older gardening references. But regardless of what you call it, this plant is 100% Florida born and raised.

Where Does Wedge Sandmat Call Home?

This Florida endemic has a pretty exclusive address – it’s found only in the Sunshine State, particularly in coastal areas and pine rocklands. Talk about being a true local!

The Sobering Reality: An Endangered Species

Here’s where things get serious, folks. Wedge sandmat isn’t just rare – it’s officially listed as Endangered in the United States, with a Global Conservation Status of S2T1. This means every single plant matters, and this species is teetering on the edge of extinction.

If you’re thinking about adding wedge sandmat to your garden (and we hope you are!), please make sure you’re getting your plants from reputable native plant nurseries that propagate their own stock. Never, ever collect plants from the wild – that could push this species closer to the brink.

What Does Wedge Sandmat Look Like?

Let’s be honest – wedge sandmat isn’t going to stop traffic with its looks. This low-growing herb produces tiny, inconspicuous flowers that you’ll need to look closely to appreciate. But sometimes the most important players work behind the scenes, right?

Growing Wedge Sandmat: For the Conservation-Minded Gardener

If you’re lucky enough to live in South Florida (USDA zones 9b-11) and want to help conserve this rare species, here’s what wedge sandmat needs to thrive:

Perfect Growing Conditions

  • Sandy, well-draining soil (think beach sand, not clay)
  • Full sun exposure
  • Excellent drainage – this plant hates wet feet
  • Minimal water once established (it’s naturally drought-tolerant)

Planting and Care Tips

  • Plant in spring after the last frost
  • Space plants appropriately for a ground cover effect
  • Water sparingly – overwatering is more dangerous than drought
  • Avoid fertilizers, which can harm native plants adapted to poor soils
  • Let it spread naturally to create habitat patches

The Perfect Garden Role

Wedge sandmat shines in specialized native Florida gardens, particularly those focused on coastal or pine rockland ecosystems. It works beautifully as a ground cover in rock gardens or xerophytic landscapes where its drought tolerance and low profile make it invaluable.

This isn’t a plant for formal flower borders or high-maintenance landscapes. Instead, think of it as a living piece of conservation history that you’re helping preserve for future generations.

A Small Plant with a Big Mission

Growing wedge sandmat isn’t just about adding another plant to your garden – it’s about joining a conservation effort. Every responsibly grown plant represents hope for this endangered species and helps maintain the genetic diversity that could be crucial for its survival.

While we don’t have extensive data on its specific benefits to pollinators and wildlife, most native plants support local ecosystems in ways we’re still discovering. By growing wedge sandmat, you’re likely providing resources for insects and other small creatures that depend on Florida’s native plant communities.

The Bottom Line

Wedge sandmat may be small and unassuming, but it carries the weight of conservation on its tiny shoulders. If you’re passionate about native plants, live in the right climate zone, and can source plants responsibly, consider making room for this rare Florida treasure. Just remember – with great plants comes great responsibility, especially when they’re fighting for their very existence.

Wedge 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 deltoidea (Engelm. ex Chapm.) Small - wedge sandmat

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