North America Native Plant

Mountain Mock Thelypody

Botanical name: Pennellia micrantha

USDA symbol: PEMI7

Life cycle: biennial

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Streptanthus micranthus A. Gray (STMI4)  âš˜  Thelypodium longifolium (Benth.) S. Watson var. catalinense M.E. Jones (THLOC)  âš˜  Thelypodium micranthum (A. Gray) S. Watson (THMI6)   

Mountain Mock Thelypody: A Lesser-Known Native Wildflower Worth Discovering If you’re on the hunt for truly unique native plants for your southwestern garden, you might want to get acquainted with mountain mock thelypody (Pennellia micrantha). This intriguing little wildflower is one of those plants that doesn’t show up in every ...

Mountain Mock Thelypody: A Lesser-Known Native Wildflower Worth Discovering

If you’re on the hunt for truly unique native plants for your southwestern garden, you might want to get acquainted with mountain mock thelypody (Pennellia micrantha). This intriguing little wildflower is one of those plants that doesn’t show up in every garden center catalog, but it has a quiet charm that makes it worth seeking out for the dedicated native plant enthusiast.

What Exactly Is Mountain Mock Thelypody?

Mountain mock thelypody belongs to the mustard family and is classified as a forb – basically a fancy botanical term for a non-woody flowering plant. Don’t let the technical jargon fool you; this simply means it’s an herbaceous plant that lacks significant woody stems above ground. The species can live as either a biennial (completing its life cycle over two years) or perennial (returning year after year), giving it some flexibility in how it approaches life.

You might also encounter this plant under its various scientific aliases, including Streptanthus micranthus, Thelypodium longifolium var. catalinense, or Thelypodium micranthum – botanists love to keep us on our toes with name changes!

Where Does It Call Home?

This native beauty has made itself at home across the American Southwest, naturally occurring in Arizona, Colorado, New Mexico, and Texas. It’s a true child of the lower 48 states, having evolved to thrive in the unique conditions that characterize this diverse region.

Should You Plant It in Your Garden?

Here’s where things get a bit tricky – mountain mock thelypody is what you might call a plant of mystery. While we know it exists and where it grows, detailed information about its specific garden performance, care requirements, and ornamental qualities is surprisingly scarce. This doesn’t necessarily mean you shouldn’t plant it, but it does mean you’d be somewhat pioneering in your approach.

If you’re the adventurous type who enjoys experimenting with lesser-known natives, this could be an exciting addition to your collection. However, if you prefer plants with well-documented growing guides and predictable behavior, you might want to start with more thoroughly studied native alternatives.

Growing Conditions and Care

While specific growing requirements for mountain mock thelypody aren’t well-documented, we can make some educated guesses based on its native habitat and family characteristics:

  • Climate: Adapted to southwestern conditions, likely preferring areas with distinct seasons and moderate to low humidity
  • Soil: Probably prefers well-draining soils, as most southwestern natives don’t appreciate soggy conditions
  • Sunlight: Likely thrives in full sun to partial shade
  • Water: Once established, probably drought-tolerant like many southwestern natives

The Mystery Factor

One of the most intriguing aspects of mountain mock thelypody is how little we know about its garden potential. Details about its exact appearance, mature size, flower characteristics, wildlife benefits, and propagation methods remain largely undocumented in readily available horticultural sources. This presents both a challenge and an opportunity for curious gardeners.

Better-Known Alternatives

If you’re drawn to the idea of growing mountain mock thelypody but want something with more predictable results, consider these well-documented southwestern natives from the same plant family:

  • Desert willow for larger spaces
  • Blanket flower for colorful blooms
  • Penstemon species for reliable pollinator attraction
  • Native lupines for interesting foliage and flowers

The Bottom Line

Mountain mock thelypody represents the fascinating world of lesser-known native plants that quietly exist in our natural landscapes but haven’t yet made the leap to mainstream horticulture. While growing it might require some detective work and patience, it could be a rewarding project for gardeners who enjoy botanical mysteries and want to support truly local flora.

If you decide to take on this challenge, consider connecting with native plant societies in the Southwest or botanical institutions that might have experience with this species. Sometimes the best gardening adventures begin with the plants that don’t come with instruction manuals!

Mountain Mock Thelypody

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Capparales

Family

Brassicaceae Burnett - Mustard family

Genus

Pennellia Nieuwl. - mock thelypody

Species

Pennellia micrantha (A. Gray) Nieuwl. - mountain mock thelypody

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