North America Native Plant

Shelly’s Mousetail

Botanical name: Ivesia rhypara var. shellyi

USDA symbol: IVRHS

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Shelly’s Mousetail: A Rare Oregon Native Worth Knowing About If you’ve stumbled across the name Shelly’s mousetail, you’ve discovered one of Oregon’s botanical treasures – though not one you’re likely to find at your local nursery anytime soon. This tiny perennial forb, scientifically known as Ivesia rhypara var. shellyi, is ...

Rare plant alert!

Region: Conservation status by state

Status: S2T1: 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) ⚘ 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) ⚘

Shelly’s Mousetail: A Rare Oregon Native Worth Knowing About

If you’ve stumbled across the name Shelly’s mousetail, you’ve discovered one of Oregon’s botanical treasures – though not one you’re likely to find at your local nursery anytime soon. This tiny perennial forb, scientifically known as Ivesia rhypara var. shellyi, is so rare that most gardeners will never encounter it in the wild, let alone in cultivation.

What Makes Shelly’s Mousetail Special

Shelly’s mousetail belongs to the rose family and is classified as a forb – essentially a soft-stemmed flowering plant that lacks woody tissue. As a perennial, it returns year after year, though its diminutive stature means it’s easily overlooked even when present. The common name mousetail likely refers to some aspect of its appearance, though detailed descriptions of this variety are scarce in horticultural literature.

Where to Find It (Or Rather, Where Not to Find It)

This native plant calls Oregon home and is found nowhere else in the United States. Its extremely limited range contributes to its conservation status, making it a true Oregon endemic.

The Rarity Factor: Why You Probably Shouldn’t Plant It

Here’s where things get serious. Shelly’s mousetail has a Global Conservation Status of S2T1, which indicates it’s critically imperiled. This rarity status means that:

  • The plant exists in very few locations
  • Its populations are extremely small
  • It faces significant threats to its survival
  • Any disturbance could impact the species’ long-term viability

For this reason, we strongly recommend against attempting to cultivate this plant unless you have access to responsibly sourced material through legitimate conservation programs. Even then, cultivation should only be undertaken by experienced botanists or conservation organizations.

Why This Matters for Native Plant Enthusiasts

While you won’t be adding Shelly’s mousetail to your garden bed anytime soon, learning about rare natives like this one helps us appreciate the incredible diversity of our regional flora. Oregon is home to numerous endemic species that exist nowhere else on Earth, and each one represents millions of years of evolutionary adaptation to specific local conditions.

Rather than seeking out this rare gem, consider supporting conservation efforts that protect the habitats where such species survive. You can also explore more common Oregon native alternatives that will thrive in your garden while supporting local ecosystems.

Conservation-Minded Alternatives

If you’re drawn to Oregon’s native flora, there are many other wonderful native options that can be responsibly cultivated:

  • Other Ivesia species that are more common and available through native plant nurseries
  • Native wildflowers that support pollinators and wildlife
  • Regional endemic plants that are not critically endangered

The Bottom Line

Shelly’s mousetail serves as a reminder that not every native plant is meant for our gardens. Sometimes the best way to appreciate a species is to learn about it, support its conservation, and choose more abundant alternatives for our landscapes. In doing so, we become better stewards of the remarkable botanical diversity that makes places like Oregon so special.

If you’re passionate about rare native plants, consider volunteering with local botanical organizations or supporting habitat conservation efforts. That’s where Shelly’s mousetail – and gardeners who care about native plants – can truly thrive.

Shelly’s Mousetail

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Rosales

Family

Rosaceae Juss. - Rose family

Genus

Ivesia Torr. & A. Gray - mousetail

Species

Ivesia rhypara Ertter & Reveal - grimy mousetail

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