North America Non-native Plant

Rattlebox

Botanical name: Crotalaria mysorensis

USDA symbol: CRMY

Native status: Not native but doesn't reproduce and persist in the wild

Rattlebox (Crotalaria mysorensis): A Mysterious Member of the Legume Family If you’ve stumbled upon the name Crotalaria mysorensis while researching native plants or browsing seed catalogs, you’re not alone in wondering what exactly this plant is all about. This particular species of rattlebox presents something of a botanical mystery, with ...

Rattlebox (Crotalaria mysorensis): A Mysterious Member of the Legume Family

If you’ve stumbled upon the name Crotalaria mysorensis while researching native plants or browsing seed catalogs, you’re not alone in wondering what exactly this plant is all about. This particular species of rattlebox presents something of a botanical mystery, with limited information available compared to its more well-known cousins in the Crotalaria family.

What is Crotalaria mysorensis?

Crotalaria mysorensis, commonly known as rattlebox, belongs to the legume family (Fabaceae). The species name mysorensis suggests a connection to the Mysore region of India, hinting at its potential geographic origins. Like other members of the Crotalaria genus, this plant likely produces the characteristic inflated seed pods that rattle when mature—hence the common name rattlebox.

Geographic Distribution and Native Status

The geographic distribution and native status of Crotalaria mysorensis remain unclear in readily available botanical literature. The species name suggests origins in or around Mysore, India, but definitive distribution data is limited.

The Challenge of Limited Information

Here’s where things get interesting (and a bit frustrating for us plant enthusiasts): reliable, specific information about Crotalaria mysorensis is surprisingly scarce. This could mean several things:

  • It’s a rare or localized species with limited distribution
  • It may be a taxonomic name that requires further verification
  • Information exists primarily in specialized botanical literature not widely accessible
  • It could be confused with or synonymous with other Crotalaria species

What We Can Learn from the Crotalaria Family

While specific details about C. mysorensis remain elusive, we can draw some general insights from what we know about the Crotalaria genus:

  • Most species are nitrogen-fixing legumes, potentially beneficial for soil health
  • They typically prefer warm climates and well-draining soils
  • Many produce bright yellow, pea-like flowers
  • The characteristic rattling seed pods make them interesting specimen plants

Should You Plant It?

Given the limited information available about Crotalaria mysorensis specifically, we’d recommend proceeding with caution. If you encounter seeds or plants labeled as this species:

  • Verify the source and ensure proper identification
  • Research whether it’s appropriate for your local climate and conditions
  • Check with local extension services about its status in your area
  • Consider well-documented native alternatives that provide similar benefits

Better-Known Native Alternatives

If you’re interested in the ecological benefits that legumes can provide—such as nitrogen fixation and pollinator support—consider exploring well-documented native alternatives in your region. Many areas have native legumes that are better studied and more readily available, such as wild senna, partridge pea, or various native clovers.

The Bottom Line

Crotalaria mysorensis represents one of those intriguing botanical puzzles that remind us how much we still have to learn about the plant kingdom. While the mystery surrounding this species makes it difficult to recommend for home gardens, it highlights the importance of choosing well-documented native plants that we know will thrive and benefit local ecosystems.

If you’re determined to explore this particular species, we’d suggest connecting with botanical gardens, university extension programs, or specialized native plant societies that might have more detailed information about its cultivation and ecological role.

Rattlebox

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

Crotalaria L. - rattlebox

Species

Crotalaria mysorensis Roth - rattlebox

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