North America Native Plant

Tunp Range Twinpod

Botanical name: Physaria dornii

USDA symbol: PHDO4

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Tunp Range Twinpod: A Rare Wyoming Gem Worth Protecting Meet one of Wyoming’s most exclusive botanical residents: the Tunp Range twinpod (Physaria dornii). This little-known native wildflower might not be splashed across seed catalogs, but for dedicated native plant gardeners and conservation enthusiasts, it represents something truly special – a ...

Rare plant alert!

Region: Conservation status by state

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) ⚘

Tunp Range Twinpod: A Rare Wyoming Gem Worth Protecting

Meet one of Wyoming’s most exclusive botanical residents: the Tunp Range twinpod (Physaria dornii). This little-known native wildflower might not be splashed across seed catalogs, but for dedicated native plant gardeners and conservation enthusiasts, it represents something truly special – a chance to help preserve one of America’s rarest mountain plants.

What Makes This Plant So Special?

The Tunp Range twinpod is what botanists call an endemic species, meaning it grows naturally in only one place on Earth. In this case, that place is a small area within Wyoming’s spectacular mountain landscapes. As a perennial forb (that’s fancy talk for a non-woody flowering plant), it returns year after year, forming low, cushion-like clusters of silvery-green foliage topped with cheerful yellow flowers.

But here’s the catch – and it’s a big one. This plant carries a Global Conservation Status of S1, meaning it’s critically imperiled. With typically five or fewer known populations and fewer than 1,000 individual plants remaining in the wild, the Tunp Range twinpod is teetering on the edge of extinction.

Where Does It Come From?

This Wyoming native calls the state’s mountainous regions home, where it has adapted to harsh alpine conditions that would challenge most garden plants. It’s found nowhere else in the United States, making it a true treasure of the American West.

Should You Grow Tunp Range Twinpod?

The short answer: Only if you can source it responsibly.

Given its critically endangered status, we absolutely cannot recommend collecting this plant from the wild – doing so could push it closer to extinction. However, if you can obtain seeds or plants through legitimate conservation programs, botanical gardens, or specialized native plant nurseries that propagate it ethically, growing Tunp Range twinpod becomes an act of conservation.

What Does It Look Like in the Garden?

Don’t expect a showstopper, but do expect subtle mountain charm. The Tunp Range twinpod forms low, compact rosettes of silvery-green leaves that create an attractive cushion effect. In late spring and early summer, small clusters of bright yellow, four-petaled flowers appear – typical of the mustard family. The entire plant stays quite small, making it perfect for rock gardens or alpine plant collections.

Perfect Garden Settings

This rare beauty shines in:

  • Rock gardens with excellent drainage
  • Alpine plant collections
  • Conservation-focused native plant gardens
  • Specialized raised beds mimicking mountain conditions
  • Educational or demonstration gardens highlighting rare species

Growing Conditions That Make It Happy

Think mountain meadow when planning for this plant:

  • Sunlight: Full sun, though some protection from intense afternoon heat in lower elevations
  • Soil: Extremely well-draining soil – soggy conditions will kill it quickly
  • Water: Minimal once established; it’s adapted to mountain conditions with natural moisture cycles
  • Hardiness: Thrives in USDA zones 3-5, where it can experience the cold winters it’s evolved to handle

Planting and Care Tips

Success with Tunp Range twinpod requires mimicking its native mountain home:

  • Plant in spring after the last frost, giving it a full season to establish
  • Create a well-draining planting area with added gravel or sand if needed
  • Water lightly during establishment, then rely mainly on natural precipitation
  • Avoid fertilizers – this plant is adapted to lean mountain soils
  • Mulch lightly with gravel rather than organic materials to prevent moisture retention
  • Be patient – rare alpine plants often grow slowly but are long-lived once established

Wildlife and Pollinator Benefits

Like other members of the mustard family, Tunp Range twinpod provides nectar and pollen for small native bees and other mountain pollinators. Every flower that blooms in a garden setting helps support these important insects while potentially contributing to the species’ genetic diversity.

A Conservation Opportunity

Growing Tunp Range twinpod isn’t just about adding an unusual plant to your collection – it’s about participating in conservation. By cultivating this rare species (responsibly sourced, of course), you’re helping preserve genetic material, supporting conservation efforts, and potentially contributing to future reintroduction programs.

If you’re passionate about rare plants and have experience with challenging alpine species, the Tunp Range twinpod offers a unique opportunity to make a real difference. Just remember: source responsibly, grow thoughtfully, and appreciate the privilege of helping protect one of Wyoming’s most endangered botanical treasures.

Tunp Range Twinpod

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

Physaria (Nutt. ex Torr. & A. Gray) A. Gray - twinpod

Species

Physaria dornii Lichvar - Tunp Range twinpod

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