North America Native Plant

Bristly Mousetail

Botanical name: Myosurus apetalus var. borealis

USDA symbol: MYAPB

Life cycle: annual

Habit: forb

Native status: Native to Canada âš˜ Native to the lower 48 states  

Synonyms: Myosurus aristatus auct. non Benth. (MYAR3)  âš˜  Myosurus minimus L. var. aristatus auct. non (Benth.) B. Boivin (MYMIA3)   

Bristly Mousetail: A Tiny Native Wildflower with Big Habitat Value Meet bristly mousetail (Myosurus apetalus var. borealis), one of nature’s more modest wildflowers that proves good things really do come in small packages. This diminutive native annual might not win any beauty contests, but it plays an important role in ...

Bristly Mousetail: A Tiny Native Wildflower with Big Habitat Value

Meet bristly mousetail (Myosurus apetalus var. borealis), one of nature’s more modest wildflowers that proves good things really do come in small packages. This diminutive native annual might not win any beauty contests, but it plays an important role in North American ecosystems and offers unique opportunities for specialized native gardens.

What is Bristly Mousetail?

Bristly mousetail is a small annual forb that belongs to the buttercup family. True to its name, this little plant produces tiny, mouse-tail-like flower spikes that are more curious than showy. Growing just 0.3 feet tall (about 4 inches), it’s definitely a plant you’ll need to look closely to appreciate.

As a forb, bristly mousetail lacks woody tissue and completes its entire life cycle in a single growing season. The plant produces inconspicuous green flowers during mid-spring, followed by small brown seeds that ensure the next generation.

Where Does It Grow Naturally?

This hardy little native calls western North America home, thriving across a impressive range that includes Alberta, British Columbia, California, Colorado, Saskatchewan, Idaho, Montana, Nevada, Oregon, Utah, Washington, and Wyoming. It’s truly a plant of both Canada and the lower 48 states, making it a genuine North American native.

Should You Plant Bristly Mousetail in Your Garden?

Let’s be honest – bristly mousetail isn’t going to be the star of your flower border. With its small green flowers and modest stature, it’s definitely not a showstopper. However, there are some compelling reasons why you might want to consider this unassuming native:

  • It’s a true North American native that supports local ecosystems
  • Perfect for naturalized areas and native plant gardens
  • Requires minimal maintenance once established
  • Provides authentic habitat for wildlife
  • Fills a unique ecological niche in seasonal wet areas

Ideal Growing Conditions

Bristly mousetail has some specific preferences that reflect its natural habitat:

  • Soil: Prefers fine to medium-textured soils; avoid coarse, sandy conditions
  • Moisture: Medium moisture use with low drought tolerance
  • pH: Thrives in slightly acidic to mildly alkaline soils (pH 6.0-8.5)
  • Sun exposure: Full sun (shade intolerant)
  • Temperature: Needs at least 80 frost-free days and minimum temperatures of 52°F
  • Precipitation: Requires 12-24 inches annually

Perfect Garden Settings

Bristly mousetail shines in specialized garden situations:

  • Native plant gardens focused on regional flora
  • Rain gardens and seasonal wetlands
  • Naturalized meadow areas
  • Wildlife habitat gardens
  • Areas with spring moisture that dry out in summer

Growing and Care Tips

The good news about bristly mousetail is that it’s relatively low-maintenance once you understand its needs:

  • Propagation: Grow from seed only – this plant doesn’t propagate vegetatively
  • Seeding: With about 175,000 seeds per pound, a little goes a long way
  • Timing: Plant seeds in fall or early spring for spring germination
  • Fertility: Medium fertility requirements – avoid over-fertilizing
  • Watering: Provide consistent moisture during spring growing season
  • Maintenance: Allow plants to self-seed for natural populations

The Bottom Line

Bristly mousetail won’t transform your garden into a showplace, but it offers something perhaps more valuable – a genuine connection to North America’s native plant heritage. If you’re creating habitat gardens, working with seasonal wet areas, or simply want to support native plant diversity, this modest little wildflower deserves consideration.

Just remember that bristly mousetail is currently not available through commercial sources, so you’ll need to collect seeds responsibly from wild populations (where legal and appropriate) or connect with native plant societies that might have seed available.

Sometimes the most important plants in our gardens are the ones that work quietly behind the scenes, supporting the intricate web of native life that makes our local ecosystems thrive.

How

Bristly Mousetail

Grows

Growing season

Spring and Summer

Lifespan
Growth form & shape

Single Crown and Semi-Erect

Growth rate

Moderate

Height at 20 years
Maximum height

0.3

Foliage color

Green

Summer foliage density

Porous

Winter foliage density

Porous

Foliage retention

No

Flowering

No

Flower color

Green

Fruit/seeds

No

Fruit/seed color

Brown

Allelopath

No

Nitrogen fixing

None

Toxic

None

C:N Ratio

Medium

Fire Resistant

No

Foliage Texture

Medium

Low-growing Grass

No

Resproutability

No

Coppice Ability

No

Bloat

None

Bristly Mousetail

Growing Conditions

Adapted to Coarse Soil

No

Adapted to Medium Soil

Yes

Adapted to Fine Soil

Yes

Anaerobic tolerance

Medium

CaCO₃ tolerance

Low

Cold Stratification

No

Drought tolerance

Low

Nutrient requirement

Medium

Fire tolerance

Low

Frost-free days minimum

80

Hedge tolerance

None

Moisture requirement

Medium

pH range

6.0 to 8.5

Plants per acre
Precipitation range (in)

12 to 24

Min root depth (in)

6

Salt tolerance

Low

Shade tolerance

Intolerant

Min temperature (F)

52

Cultivating

Bristly Mousetail

Flowering season

Mid Spring

Commercial availability

No Known Source

Fruit/seed abundance

Low

Fruit/seed season

Spring to Summer

Fruit/seed persistence

No

Propagated by bare root

No

Propagated by bulb

No

Propagated by container

No

Propagated by corm

No

Propagated by cuttings

No

Propagated by seed

Yes

Propagated by sod

No

Propagated by sprigs

No

Propagated by tubers

No

Seed per pound

175000

Seed spread rate

Moderate

Seedling vigor

Medium

Small grain

No

Vegetative spread rate

None

Bristly Mousetail

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Magnoliidae

Order

Ranunculales

Family

Ranunculaceae Juss. - Buttercup family

Genus

Myosurus L. - mousetail

Species

Myosurus apetalus C. Gay - bristly mousetail

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