Avon Park Rattlebox

Crotalaria avonensis is a rare species of flowering plant in the legume family known by the common names Avon Park rattlebox, Avon Park harebells, and Avon Park rabbit-bells. It is endemic to Central Florida in the United States, where it is known from only three sites. Many individuals exist on land that is unprotected and they are threatened with destruction. The plant is a federally listed endangered species.

This is a perennial herb with one to three hairy stems growing from a taproot. Most of the stem is located underground, with up to 10 centimeters growing above the surface. The stems are lined with fleshy oval leaves which are coated in white or yellowish hairs. The inflorescence is a raceme of yellow pealike flowers around a centimeter long. The fruit is an inflated legume pod in shades of dark red or brown which can be up to 2.5 centimeters in length and contains 18 seeds. After the plant flowers in spring it becomes dormant for the rest of the year.