North America Native Plant

Pinaleno Mountain Rubberweed

Botanical name: Hymenoxys ambigens var. neomexicana

USDA symbol: HYAMN

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Pinaleno Mountain Rubberweed: A Rare Native Gem Worth Protecting Meet Pinaleno Mountain rubberweed (Hymenoxys ambigens var. neomexicana), a little-known native perennial that’s as rare as it sounds intriguing. If you’re a gardener who loves supporting native plants and conservation efforts, this unassuming forb might just capture your heart—though finding it ...

Rare plant alert!

Region: Conservation status by state

Status: S3?T2?: Status is uncertain but is somewhere between the following rankings: Inexact rank: ⚘ Subspecies or variety is 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) ⚘ Vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals ⚘

Pinaleno Mountain Rubberweed: A Rare Native Gem Worth Protecting

Meet Pinaleno Mountain rubberweed (Hymenoxys ambigens var. neomexicana), a little-known native perennial that’s as rare as it sounds intriguing. If you’re a gardener who loves supporting native plants and conservation efforts, this unassuming forb might just capture your heart—though finding it might prove to be quite the treasure hunt!

What Makes This Plant Special?

This native rubberweed is a true American original, belonging to the diverse family of plants native to the lower 48 states. As a perennial forb, it’s an herbaceous plant that comes back year after year without developing woody stems. Think of it as nature’s way of creating a low-maintenance garden resident that knows how to stick around without taking over.

Where Does It Call Home?

Currently documented in New Mexico, Pinaleno Mountain rubberweed has a very limited natural range. This narrow distribution is part of what makes it so special—and so rare. It’s like having a local celebrity in the plant world, known only to a select few lucky enough to encounter it in the wild.

A Plant That Needs Our Help

Here’s where things get serious for a moment. This rubberweed carries a conservation status of S3?T2?, which essentially means scientists are still figuring out exactly how rare it is, but they’re concerned enough to keep a close eye on it. This isn’t your run-of-the-mill garden center plant—it’s a botanical treasure that needs our protection.

If you’re interested in growing this plant, please only source it from reputable native plant nurseries that practice responsible propagation methods. Never collect from wild populations.

Why Consider Growing It?

Despite the challenges in sourcing, there are compelling reasons to consider this native:

  • Conservation impact: Growing rare natives in your garden helps preserve genetic diversity
  • True local character: You’ll be growing something genuinely special to your region
  • Low-maintenance nature: As a native perennial, it’s adapted to local conditions
  • Educational value: It’s a conversation starter about native plant conservation

The Growing Challenge

Here’s the honest truth: specific growing information for this particular variety is limited, which reflects just how rare and understudied it is. As a member of the Hymenoxys genus, it likely prefers:

  • Well-draining soil
  • Full sun exposure
  • Minimal supplemental watering once established
  • Rocky or sandy soil conditions

However, without extensive cultivation experience, growing this plant successfully might require some experimentation and patience. Consider it a gardening adventure for the truly dedicated native plant enthusiast!

The Bottom Line

Pinaleno Mountain rubberweed represents something bigger than just another garden plant—it’s a piece of our natural heritage that deserves protection and appreciation. While it may not be the easiest plant to find or grow, for conservation-minded gardeners willing to do the research and source responsibly, it offers a unique opportunity to participate in preserving America’s botanical diversity.

If you can’t find this specific variety, consider supporting conservation efforts for rare plants in your area, or choose other native Hymenoxys species that might be more readily available. Every native plant in our gardens is a step toward supporting local ecosystems and preserving our natural heritage for future generations.

Pinaleno Mountain Rubberweed

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Asterales

Family

Asteraceae Bercht. & J. Presl - Aster family

Genus

Hymenoxys Cass. - rubberweed

Species

Hymenoxys ambigens (S.F. Blake) Bierner - Pinaleno Mountain rubberweed

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