North America Native Plant

Avon Park Rattlebox

Botanical name: Crotalaria avonensis

USDA symbol: CRAV

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Avon Park Rattlebox: A Critically Endangered Florida Native If you’ve stumbled across the name Avon Park rattlebox while researching native Florida plants, you’ve discovered one of the state’s most endangered botanical treasures. This rare perennial herb has a story that’s both fascinating and sobering for anyone interested in native plant ...

Rare plant alert!

Region: United States

Status: S1: Status is uncertain but is somewhere between the following rankings: Critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘ Endangered: In danger of extinction throughout all or a significant portion of its range. ⚘

Region: United States

Avon Park Rattlebox: A Critically Endangered Florida Native

If you’ve stumbled across the name Avon Park rattlebox while researching native Florida plants, you’ve discovered one of the state’s most endangered botanical treasures. This rare perennial herb has a story that’s both fascinating and sobering for anyone interested in native plant conservation.

What Makes This Plant Special

Crotalaria avonensis, commonly known as Avon Park rattlebox, is a native Florida perennial that belongs to the legume family. As a forb (an herbaceous flowering plant), it lacks the woody stems of shrubs and trees, instead producing soft, green growth that dies back seasonally while the root system persists year after year.

A Florida Exclusive

This plant calls only one state home: Florida. Even within the Sunshine State, Avon Park rattlebox has an incredibly limited range, making it one of Florida’s most geographically restricted native species.

The Rarity Reality Check

Here’s where things get serious: Avon Park rattlebox carries a Global Conservation Status of S1, meaning it’s critically imperiled. With typically five or fewer known occurrences and fewer than 1,000 remaining individuals, this species teeters on the brink of extinction. In the United States, it’s officially listed as Endangered.

What does this mean for gardeners? Simply put, this isn’t a plant you should be looking to add to your landscape.

Why You Shouldn’t Plant Avon Park Rattlebox

While the desire to help rare plants by growing them is admirable, Avon Park rattlebox presents several challenges:

  • Its extreme rarity means seeds or plants are not commercially available
  • Removing any material from wild populations could further harm the species
  • Its specific habitat requirements are poorly understood
  • Conservation efforts are best left to professional botanists and authorized programs

Supporting Conservation Instead

Rather than attempting to grow this endangered species, consider these alternatives:

  • Support organizations working to protect Florida’s native habitats
  • Choose other native Crotalaria species that aren’t endangered
  • Volunteer with local native plant societies
  • Advocate for habitat preservation in Florida

The Bigger Picture

Avon Park rattlebox serves as a reminder of how fragile our native ecosystems can be. While we can’t all grow this particular species, we can contribute to conservation by choosing other native plants for our gardens, supporting habitat protection, and spreading awareness about endangered species.

Sometimes the best way to love a plant is to admire it from afar and work to protect the wild spaces where it belongs. In the case of Avon Park rattlebox, that respect for its rarity might just help ensure future generations can learn about this remarkable Florida endemic.

Avon Park 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 avonensis DeLaney & Wunderlin - Avon Park rattlebox

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