North America Native Plant

Clasping Jewelflower

Botanical name: Streptanthus maculatus

USDA symbol: STMA2

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Clasping Jewelflower: A Rare Native Gem Worth Growing Responsibly If you’re passionate about native plants and conservation gardening, you’ve probably never heard of clasping jewelflower (Streptanthus maculatus). This little-known wildflower is a true hidden treasure of the American South, but it comes with an important caveat that every responsible gardener ...

Rare plant alert!

Region: Conservation status by state

Status: S3: Status is uncertain but is somewhere between the following rankings: Vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals ⚘

Clasping Jewelflower: A Rare Native Gem Worth Growing Responsibly

If you’re passionate about native plants and conservation gardening, you’ve probably never heard of clasping jewelflower (Streptanthus maculatus). This little-known wildflower is a true hidden treasure of the American South, but it comes with an important caveat that every responsible gardener should know about.

What Makes Clasping Jewelflower Special?

Clasping jewelflower is a charming annual or biennial forb—basically a non-woody flowering plant that completes its life cycle in one or two years. What sets this plant apart is its distinctive appearance: small purple to pink flowers bloom in spring above unique clasping leaves that seem to wrap around the stem. It’s this leaf characteristic that gives the plant its common name.

As a native species, clasping jewelflower belongs naturally in the landscapes of the south-central United States. This wildflower has evolved alongside local wildlife and pollinators for thousands of years, making it a valuable addition to any native plant garden.

Where Does It Grow Naturally?

Clasping jewelflower has a relatively limited native range, naturally occurring in just three states: Arkansas, Oklahoma, and Texas. This restricted distribution is actually one of the reasons the plant faces conservation challenges today.

A Word of Caution: This Plant Is Vulnerable

Here’s the important part every gardener needs to know: clasping jewelflower has a Global Conservation Status of S3, which means it’s considered vulnerable. With only 21 to 100 known occurrences and an estimated 3,000 to 10,000 individuals remaining in the wild, this species is at risk of disappearing from its native range.

If you decide to grow clasping jewelflower, please only use responsibly sourced material. This means:

  • Purchase seeds or plants from reputable native plant nurseries
  • Never collect seeds or plants from wild populations
  • Consider supporting conservation efforts for this species
  • Share seeds with other gardeners to help increase cultivation

Why Grow Clasping Jewelflower?

Despite its rarity—or perhaps because of it—clasping jewelflower offers several compelling reasons to include it in your garden:

  • Conservation impact: Growing rare natives helps preserve genetic diversity
  • Pollinator support: The flowers attract native bees and other small pollinators
  • Low maintenance: Once established, it’s quite drought tolerant
  • Unique beauty: Those distinctive clasping leaves and delicate flowers add visual interest
  • Educational value: A great conversation starter about plant conservation

Perfect Garden Settings

Clasping jewelflower thrives in wildflower gardens, native plant collections, and prairie-style landscapes. It’s particularly well-suited for:

  • Native plant demonstration gardens
  • Wildflower meadows
  • Conservation-focused landscapes
  • Educational or botanical gardens

Growing Conditions and Care

The good news is that clasping jewelflower isn’t particularly fussy once you understand its needs:

Climate: Hardy in USDA zones 6-9, which covers most of its native range and beyond

Light: Prefers full sun but can tolerate partial shade

Soil: Well-drained soils are essential—this plant doesn’t like wet feet

Water: Drought tolerant once established, but benefits from occasional watering during dry spells

Planting and Care Tips

Growing clasping jewelflower successfully is fairly straightforward:

  • Timing: Direct sow seeds in fall for spring germination
  • Soil prep: Ensure good drainage—amend heavy clay soils if necessary
  • Watering: Water gently until established, then reduce frequency
  • Maintenance: Minimal care needed—let plants go to seed to encourage natural reseeding
  • Companion plants: Pair with other native wildflowers and grasses from the same region

The Bottom Line

Clasping jewelflower represents both an opportunity and a responsibility for native plant gardeners. While its vulnerable status means we need to be careful about how we source and grow it, cultivating this rare beauty can play a small but meaningful role in conservation efforts.

If you’re drawn to the idea of growing something truly special—a plant that most gardeners have never even heard of—clasping jewelflower might be perfect for your native garden. Just remember to source it responsibly and share the conservation message with fellow gardeners. Every seed saved and shared is a small victory for this vulnerable species.

Clasping Jewelflower

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

Streptanthus Nutt. - twistflower

Species

Streptanthus maculatus Nutt. - clasping jewelflower

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