Crotalaria spectabilis, the showy rattlebox or showy rattlepod, is a species of flowering plant in the pea family Fabaceae.

It is native to the Indian Subcontinent, southern China, and Southeast Asia.

[1] It is a perennial herb that grows up to 0.6–1.5 m (24–59 in) tall.

[2] It was introduced (originally as a green manure) to most of the world's tropics and subtropics and is now a serious agricultural pest species.

[3] It is toxic to livestock, causing liver damage.