North America Native Plant

Uinta Basin Waxfruit

Botanical name: Glaucocarpum suffrutescens

USDA symbol: GLSU

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Synonyms: Schoenocrambe suffrutescens (Rollins) S.L. Welsh & Chatterley (SCSU2)  âš˜  Thelypodium suffrutescens Rollins (THSU4)   

Uinta Basin Waxfruit: A Rare Utah Native Worth Protecting Meet the Uinta Basin waxfruit (Glaucocarpum suffrutescens), one of Utah’s most endangered native plants. This remarkable little perennial herb might not be filling up garden centers anytime soon, but it deserves our attention for all the right reasons – and a ...

Rare plant alert!

Region: United States

Status: S1: Status is uncertain but is somewhere between the following rankings: 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) ⚘ Endangered: In danger of extinction throughout all or a significant portion of its range. ⚘

Region: United States

Uinta Basin Waxfruit: A Rare Utah Native Worth Protecting

Meet the Uinta Basin waxfruit (Glaucocarpum suffrutescens), one of Utah’s most endangered native plants. This remarkable little perennial herb might not be filling up garden centers anytime soon, but it deserves our attention for all the right reasons – and a few cautionary ones too.

What Makes This Plant Special

The Uinta Basin waxfruit is a true Utah original, found nowhere else in the world except in the Uinta Basin region of northeastern Utah. This perennial forb herb belongs to the mustard family and represents a unique piece of our native botanical heritage. Unlike woody shrubs or trees, this plant lacks significant woody tissue and maintains its life through underground structures that survive year after year.

Where You’ll Find It (If You’re Lucky)

This rare gem calls only Utah home, specifically the Uinta Basin area. Its extremely limited geographic distribution is just one reason why this plant faces such serious conservation challenges.

Why You Probably Shouldn’t Plant It (And Why That’s Actually Good News)

Here’s where we need to have a serious conversation. The Uinta Basin waxfruit carries some pretty sobering statistics:

  • Global Conservation Status: S1 (Critically Imperiled)
  • US Status: Endangered
  • Estimated occurrences: 5 or fewer locations
  • Remaining individuals: Likely fewer than 1,000 plants

With numbers like these, this isn’t a plant for your average garden project. In fact, attempting to grow it without proper permits and responsibly sourced material could actually harm wild populations. Instead of adding it to your shopping list, consider it a plant to admire from afar and support through conservation efforts.

What We Know About Growing Conditions

While specific cultivation information is limited due to its rarity, we can make some educated guesses based on its native habitat:

  • USDA Hardiness Zones: Likely 4-6 (typical for Utah’s elevation)
  • Climate: Adapted to Utah’s arid to semi-arid conditions
  • Soil: Probably tolerates alkaline, well-draining soils common in the region
  • Water: Likely drought-tolerant once established

Better Alternatives for Your Garden

Instead of trying to grow this endangered species, consider these Utah native alternatives that can give you that authentic regional feel without conservation concerns:

  • Other native Utah mustard family plants
  • Drought-tolerant perennial forbs native to your specific area
  • Plants that support the same ecosystem functions

How You Can Help

The best thing any gardener can do for the Uinta Basin waxfruit is support its conservation rather than cultivation:

  • Support organizations working on Utah plant conservation
  • Choose other native Utah plants for your landscape
  • Spread awareness about rare plant conservation
  • Report any suspected sightings to local botanists or conservation organizations

The Bottom Line

The Uinta Basin waxfruit represents everything that’s both wonderful and fragile about our native plant heritage. While it’s not destined for garden centers, it serves as an important reminder of why protecting native plant habitats matters. Sometimes the best way to appreciate a plant is to leave it wild and work to ensure it stays that way for future generations.

If you’re passionate about rare plants, channel that energy into supporting conservation efforts and choosing other native species that can thrive in cultivation without conservation concerns. Your garden can still be a celebration of native biodiversity – just with species that aren’t hanging on by a thread in the wild.

Uinta Basin Waxfruit

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Capparales

Family

Brassicaceae Burnett - Mustard family

Genus

Glaucocarpum Rollins - waxfruit mustard

Species

Glaucocarpum suffrutescens (Rollins) Rollins - Uinta Basin waxfruit

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