North America Native Plant

Isely’s Stickpea

Botanical name: Calliandra iselyi

USDA symbol: CAIS2

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Isely’s Stickpea: A Rare Texas Native Worth Knowing About If you’re a native plant enthusiast with a passion for rare treasures, you might have stumbled across the name Isely’s stickpea (Calliandra iselyi). This little-known Texas native is one of those plants that makes you feel like you’ve discovered a botanical ...

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 ⚘

Isely’s Stickpea: A Rare Texas Native Worth Knowing About

If you’re a native plant enthusiast with a passion for rare treasures, you might have stumbled across the name Isely’s stickpea (Calliandra iselyi). This little-known Texas native is one of those plants that makes you feel like you’ve discovered a botanical secret – mainly because it’s incredibly rare and not something you’ll find at your local nursery.

What Makes Isely’s Stickpea Special?

Isely’s stickpea is a perennial shrub that calls Texas home. Like other members of the Calliandra family, it’s part of the legume clan, which means it has that special superpower of fixing nitrogen in the soil. This multi-stemmed woody plant typically stays under 13-16 feet tall, though it’s more likely to remain much smaller in most conditions.

The plant is native to Texas and can be found nowhere else in the wild – talk about Texas pride! Unfortunately, this exclusivity comes with a serious conservation concern.

The Rarity Reality Check

Here’s where things get serious, folks. Isely’s stickpea has a Global Conservation Status of S3, which translates to Vulnerable. This means it’s either very rare throughout its range, found only in restricted areas, or facing other factors that make it vulnerable to disappearing entirely. We’re talking about somewhere between 21 to 100 known occurrences, with an estimated 3,000 to 10,000 individual plants in the wild.

What this means for gardeners: If you’re thinking about adding this plant to your garden, you need to be extremely careful about sourcing. Only consider planting Isely’s stickpea if you can obtain it from a reputable native plant society or conservation program that uses responsibly collected seed or ethically propagated material.

Should You Grow Isely’s Stickpea?

The honest answer? Probably not, unless you’re involved in conservation efforts or have access to responsibly sourced material. Here’s why:

  • It’s incredibly rare and vulnerable in the wild
  • Very limited availability from ethical sources
  • Minimal information available about cultivation requirements
  • Better to focus conservation efforts on protecting existing wild populations

Better Alternatives for Your Texas Garden

Instead of hunting for this rare gem, consider these more available Texas native alternatives that offer similar benefits:

  • Fairy Duster (Calliandra eriophylla) – if you’re in the right region
  • Fragrant Mimosa (Mimosa borealis)
  • Other native Texas legumes like various Dalea species

How You Can Help

Rather than trying to grow Isely’s stickpea in your backyard, here are better ways to support this rare species:

  • Support Texas native plant societies and conservation organizations
  • Participate in native plant habitat restoration projects
  • Choose other native plants for your landscape
  • Spread awareness about rare Texas natives

The Bottom Line

Isely’s stickpea represents one of those fascinating botanical mysteries that reminds us how much we still don’t know about our native flora. While it might be tempting to want this rare plant in your collection, the best thing we can do is respect its vulnerable status and focus our gardening energy on more common native species that won’t put additional pressure on wild populations.

Sometimes the most responsible thing a plant lover can do is admire from afar and work to protect what’s left in the wild. Isely’s stickpea is definitely one of those times.

Isely’s Stickpea

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

Calliandra Benth. - stickpea

Species

Calliandra iselyi B.L. Turner - Isely's stickpea

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