North America Native Plant

Imberis Woodyaster

Botanical name: Xylorhiza tortifolia var. imberbis

USDA symbol: XYTOI

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Synonyms: Machaeranthera tortifolia (Torr. & A. Gray) Cronquist & D.D. Keck var. imberbis Cronquist (MATOI)   

Imberbis Woodyaster: A Lesser-Known Desert Native Worth Discovering Meet the imberbis woodyaster (Xylorhiza tortifolia var. imberbis), a charming desert native that’s probably not on your radar yet—but maybe it should be! This perennial wildflower belongs to the fascinating world of southwestern desert plants, bringing a touch of understated beauty to ...

Imberbis Woodyaster: A Lesser-Known Desert Native Worth Discovering

Meet the imberbis woodyaster (Xylorhiza tortifolia var. imberbis), a charming desert native that’s probably not on your radar yet—but maybe it should be! This perennial wildflower belongs to the fascinating world of southwestern desert plants, bringing a touch of understated beauty to the arid landscapes of the American Southwest.

What Exactly Is Imberbis Woodyaster?

The imberbis woodyaster is a variety of the desert woody aster, scientifically known as Xylorhiza tortifolia var. imberbis. Don’t let that mouthful of a name intimidate you—this little plant is actually quite approachable! It’s classified as a forb, which is simply a fancy way of saying it’s a non-woody flowering plant that comes back year after year.

You might also encounter this plant under its synonym Machaeranthera tortifolia var. imberbis in older botanical references, but don’t worry—it’s the same delightful desert dweller.

Where Does It Call Home?

This native beauty has made itself comfortable across three southwestern states: Arizona, Nevada, and Utah. It’s perfectly adapted to life in the harsh yet stunning desert environments of this region, where it has evolved alongside other desert specialists for thousands of years.

Why Consider This Desert Native?

As a native plant enthusiast, you’re probably wondering what makes the imberbis woodyaster special. Here’s the thing—this particular variety is somewhat of a botanical mystery, with limited detailed information available about its specific characteristics and growing requirements. However, being a native desert plant, it likely offers several advantages:

  • Exceptional drought tolerance once established
  • Adapted to challenging desert conditions
  • Supports local desert ecosystems
  • Requires minimal water once mature
  • Authentic addition to regional native plant gardens

Garden Design and Landscape Use

While specific information about this variety’s role in garden design is limited, desert natives like the imberbis woodyaster are typically excellent choices for:

  • Xeriscaping projects
  • Desert-themed gardens
  • Water-wise landscaping
  • Native plant restoration areas
  • Rock gardens in appropriate climates

The Growing Challenge

Here’s where things get honest: specific growing information for Xylorhiza tortifolia var. imberbis is surprisingly scarce. This variety seems to be one of those botanical gems that flies under the radar, even in native plant circles. What we do know is that it’s a perennial forb native to desert regions, which gives us some clues about its preferences.

Based on its desert origins and classification, it likely prefers:

  • Full sun exposure
  • Well-draining, sandy or rocky soils
  • Minimal supplemental watering
  • Hot, dry growing conditions

A Word of Caution for Gardeners

If you’re intrigued by this desert native, proceed with careful research. The limited available information means you’ll want to:

  • Source plants or seeds from reputable native plant nurseries
  • Consult with local botanical gardens or native plant societies
  • Consider it an experimental addition rather than a landscape staple
  • Have backup native alternatives in mind

The Bottom Line

The imberbis woodyaster represents the fascinating world of lesser-known native plants that deserve more attention. While we may not have all the growing details figured out, its status as a southwestern native makes it worth considering for the right garden and the right gardener—particularly those who enjoy botanical adventures and supporting regional biodiversity.

If you’re passionate about desert natives and don’t mind a bit of gardening mystery, this could be an interesting addition to your collection. Just remember to do your homework, source responsibly, and maybe try it in a small test area first. Sometimes the most rewarding plants are the ones that challenge us to learn something new!

Imberis 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 tortifolia (Torr. & A. Gray) Greene - Mojave woodyaster

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