North America Native Plant

Sampson’s Snakeroot

Botanical name: Orbexilum pedunculatum var. psoralioides

USDA symbol: ORPEP

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Orbexilum gracile (Torr. & A. Gray) Rydb. (ORGR3)  âš˜  Orbexilum pedunculatum (Mill.) Rydb. var. gracile (Torr. & A. Gray) J. Grimes (ORPEG)  âš˜  Psoralea psoralioides (Walter) Cory (PSPS)  âš˜  Psoralea psoralioides (Walter) Cory var. gracilis (Torr. & A. Gray) Freeman (PSPSG)   

Sampson’s Snakeroot: A Hidden Gem for Southeastern Native Gardens If you’re looking for a charming native wildflower that doesn’t demand the spotlight but quietly adds beauty and ecological value to your garden, let me introduce you to Sampson’s snakeroot (Orbexilum pedunculatum var. psoralioides). This delightful perennial might not be the ...

Sampson’s Snakeroot: A Hidden Gem for Southeastern Native Gardens

If you’re looking for a charming native wildflower that doesn’t demand the spotlight but quietly adds beauty and ecological value to your garden, let me introduce you to Sampson’s snakeroot (Orbexilum pedunculatum var. psoralioides). This delightful perennial might not be the flashiest plant in the native gardening world, but it’s definitely one worth getting to know!

What Is Sampson’s Snakeroot?

Sampson’s snakeroot is a native perennial forb that calls the southeastern United States home. As a member of the pea family, it produces lovely small purple-blue flowers arranged in distinctive spikes that dance above compound leaves. Don’t let the somewhat intimidating botanical name fool you – this is actually a pretty easy-going plant once you understand its preferences.

Like many native plants, this species has quite the collection of former names, including Orbexilum gracile and various Psoralea species names. Botanists sure do love to keep us on our toes with name changes!

Where Does It Naturally Grow?

This native beauty naturally occurs across the southeastern states, including Florida, Georgia, Kentucky, Maryland, North Carolina, South Carolina, and Virginia. It’s perfectly adapted to the climate and growing conditions of these regions, making it an excellent choice for gardeners looking to support local ecosystems.

Why Consider Sampson’s Snakeroot for Your Garden?

There are several compelling reasons to give this native plant a spot in your landscape:

  • Native pollinator support: The flowers attract native bees and butterflies, helping support local pollinator populations
  • Low maintenance: Once established, it’s quite drought tolerant and doesn’t require fussy care
  • Ecological authenticity: As a true native, it fits perfectly into natural ecosystem relationships
  • Understated beauty: The delicate flowers and attractive foliage add subtle charm without overwhelming other plants

Growing Conditions and Care

Sampson’s snakeroot is surprisingly accommodating when it comes to growing conditions. Here’s what it prefers:

  • Light: Partial shade works best, though it can tolerate some morning sun
  • Soil: Well-drained soils are essential – it doesn’t appreciate wet feet
  • Hardiness: Thrives in USDA zones 6-9
  • Water: Drought tolerant once established, but appreciates occasional watering during extended dry spells

Perfect Garden Companions

This native forb shines in woodland gardens and naturalized areas where it can mingle with other southeastern natives. Consider pairing it with native ferns, wild ginger, or other shade-loving wildflowers for a truly authentic native plant community.

The Bottom Line

While Sampson’s snakeroot might not be the showstopper of your garden, it’s exactly the kind of dependable native plant that forms the backbone of a healthy, sustainable landscape. If you’re gardening in its native range and want to support local wildlife while adding gentle beauty to shaded areas, this perennial deserves serious consideration. Plus, there’s something deeply satisfying about growing a plant that has been thriving in your region for thousands of years – it just feels right!

Remember, when sourcing this or any native plant, try to find nurseries that propagate from local genetic stock. Your local ecosystem will thank you for choosing plants that truly belong in your corner of the world.

Sampson’s Snakeroot

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

Fabales

Family

Fabaceae Lindl. - Pea family

Genus

Orbexilum Raf. - leather-root

Species

Orbexilum pedunculatum (Mill.) Rydb. - Sampson's snakeroot

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