North America Native Plant

Smooth Woodyaster

Botanical name: Xylorhiza glabriuscula var. linearifolia

USDA symbol: XYGLL

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Synonyms: Machaeranthera linearifolia (T.J. Watson) Cronquist (MALI6)   

Smooth Woodyaster: A Rare Utah Native Worth Protecting Meet the smooth woodyaster (Xylorhiza glabriuscula var. linearifolia), a little-known gem that’s quietly holding down the fort in Utah’s unique landscapes. This perennial herb might not be the showiest plant in your garden center, but it carries the special distinction of being ...

Rare plant alert!

Region: Conservation status by state

Status: S4T1T2: 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) ⚘ 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) ⚘ Apparently Secure: Uncommon but not rare, and usually widespread. Possibly cause for longterm concern. Typically more than 100 occurrences in the state or more than 10,000 individuals ⚘

Smooth Woodyaster: A Rare Utah Native Worth Protecting

Meet the smooth woodyaster (Xylorhiza glabriuscula var. linearifolia), a little-known gem that’s quietly holding down the fort in Utah’s unique landscapes. This perennial herb might not be the showiest plant in your garden center, but it carries the special distinction of being a true Utah endemic – and that makes it pretty special indeed.

What Makes Smooth Woodyaster Special?

Smooth woodyaster is what botanists call a forb herb – essentially a non-woody perennial plant that dies back to ground level each winter and returns fresh each spring. Don’t let the woody in its name fool you; this plant is all about herbaceous growth with delicate, linear leaves that give it a graceful, almost grass-like appearance.

The plant produces charming daisy-like flowers typical of the aster family, creating small bursts of color in its native habitat. While it may not compete with garden center favorites for pure visual drama, its understated beauty and ecological significance more than make up for any lack of flashiness.

Where Does It Call Home?

This is where things get really interesting – and a bit concerning. Smooth woodyaster is found exclusively in Utah, making it a true endemic species. Its limited geographical distribution means you won’t stumble across this plant anywhere else in the world.

A Conservation Concern

Here’s something every gardener should know: smooth woodyaster has a Global Conservation Status that indicates it’s quite rare. This isn’t just another pretty native plant – it’s a species that needs our help to survive and thrive. The limited range and rarity status mean this plant is walking a tightrope between persistence and potential decline.

If you’re considering adding smooth woodyaster to your garden, please only obtain plants or seeds from reputable native plant societies or conservation organizations that source materials responsibly. Never collect from wild populations – every plant in the wild is precious for the species’ survival.

Growing Smooth Woodyaster: What You Need to Know

Want to become a conservation hero in your own backyard? Here’s what smooth woodyaster likely needs to thrive:

  • Well-draining soil: Like many Utah natives, this plant probably can’t stand wet feet
  • Full sun to partial shade: Give it the bright conditions it’s evolved to love
  • Minimal water: Once established, it should handle drought like a champ
  • Rocky or sandy soil: Think about Utah’s natural landscapes – this plant likes it lean and mean
  • USDA Zones 4-8: Should handle cold Utah winters without complaint

Perfect for the Right Garden

Smooth woodyaster isn’t for every garden, but it’s perfect for specific situations:

  • Native plant gardens focused on Utah species
  • Rock gardens and xeriscapes
  • Conservation collections
  • Educational gardens showcasing rare plants
  • Low-maintenance landscapes that celebrate local ecology

Supporting Local Wildlife

As a member of the aster family, smooth woodyaster likely provides nectar and pollen for native bees, butterflies, and other pollinators. By growing rare native plants like this one, you’re not just adding something unique to your garden – you’re creating habitat that supports the intricate web of life that has evolved alongside these plants for thousands of years.

The Bottom Line

Should you plant smooth woodyaster? If you’re passionate about conservation, live in an appropriate climate zone, and can source plants responsibly, absolutely! You’ll be participating in the preservation of Utah’s unique botanical heritage while adding a conversation-starting native to your landscape.

Just remember: with rare plants comes responsibility. Every smooth woodyaster in cultivation is a small victory for conservation, but only if we’re growing them the right way – sustainably, responsibly, and with deep respect for their wild populations.

Sometimes the most rewarding plants aren’t the ones that make the biggest splash, but the ones that connect us most deeply to the irreplaceable natural heritage of our local landscapes.

Smooth Woodyaster

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

Xylorhiza Nutt. - woodyaster

Species

Xylorhiza glabriuscula Nutt. - smooth woodyaster

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