North America Native Plant

Eared Timonius

Botanical name: Timonius subauritus var. subauritus

USDA symbol: TISUS2

Life cycle: perennial

Habit: shrub

Native status: Native to Pacific Basin excluding Hawaii  

Eared Timonius: A Pacific Island Native Worth Knowing Meet the eared timonius (Timonius subauritus var. subauritus), a charming native shrub that calls the Pacific islands home. While this perennial beauty might not be the most well-known plant in the gardening world, it offers unique value for those lucky enough to ...

Eared Timonius: A Pacific Island Native Worth Knowing

Meet the eared timonius (Timonius subauritus var. subauritus), a charming native shrub that calls the Pacific islands home. While this perennial beauty might not be the most well-known plant in the gardening world, it offers unique value for those lucky enough to garden in its native range or similar climates.

What Makes Eared Timonius Special?

This delightful shrub belongs to the diverse world of native Pacific Basin flora, specifically thriving in Guam and Palau. As a perennial, multi-stemmed woody plant, eared timonius typically grows as a shrub reaching heights of 13 to 16 feet, though it can sometimes surprise you by growing taller or developing a single stem depending on environmental conditions.

Where Does It Call Home?

Eared timonius is native to the Pacific Basin, excluding Hawaii, with confirmed populations in Guam and Palau. This limited geographic distribution makes it a true treasure for those gardening in these specific island locations.

Why Consider Eared Timonius for Your Garden?

If you’re fortunate enough to live within its native range, here are compelling reasons to consider this native shrub:

  • It’s perfectly adapted to local climate conditions
  • Supports local ecosystem health as a native species
  • Requires minimal intervention once established in suitable conditions
  • Offers authentic island landscaping character

The Challenge: Limited Growing Information

Here’s where eared timonius gets interesting (and a bit mysterious). Unlike many popular garden plants, specific cultivation information for this variety is quite limited. This scarcity of growing guides reflects its specialized native habitat and perhaps limited cultivation outside its natural range.

What We Know About Growing Eared Timonius

While detailed growing information is scarce, we can make educated assumptions based on its native habitat:

  • Climate needs: Likely thrives in tropical to subtropical conditions similar to its native Pacific island environment
  • Growth habit: Multi-stemmed shrub that can reach 13-16 feet in typical conditions
  • Longevity: As a perennial, expect this plant to be a long-term garden companion

Is This Plant Right for Your Garden?

Eared timonius is best suited for gardeners who:

  • Live within or near its native range (Guam, Palau, or similar Pacific climates)
  • Appreciate native plants and want to support local ecosystems
  • Don’t mind working with a less commonly cultivated species
  • Have patience for a plant that may require some trial and error in cultivation

A Word of Caution for Non-Native Gardeners

If you’re gardening outside the Pacific Basin region, eared timonius may not be the best choice for your landscape. Its specific adaptation to Pacific island conditions means it likely won’t thrive in dramatically different climates. Instead, consider researching native shrubs in your local area that can provide similar landscape benefits while supporting your local ecosystem.

The Bottom Line

Eared timonius represents the fascinating world of specialized native plants that have evolved for very specific environments. While it may not be the easiest plant to grow or find information about, it offers incredible value for Pacific island gardeners looking to create authentic, sustainable landscapes that honor their local natural heritage.

If you’re in Guam, Palau, or a similar Pacific location, consider seeking out this native gem through local native plant societies or botanical institutions. You might just discover a wonderful addition to your island paradise that connects your garden directly to the unique natural history of your region.

Eared Timonius

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

Rubiales

Family

Rubiaceae Juss. - Madder family

Genus

Timonius DC.

Species

Timonius subauritus Valeton - eared timonius

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