Common Names
Button snakeroot eryngo, button snakeroot, corn snakeroot, eryngo, feverweed, rattlesnake flag, rattlesnake master, rattlesnake weed, water eryngo.

Description
An erect, coarse-branched, perennial that grows to ½ to 5 feet in height. It has firm elongate-to-lanceolate lower leaves; upper leaves are sessile. The plant bears fruit from September to November.

Flowering Period
Late July to September.

Habitat
Fresh to brackish marshes, streams, ponds and bogs, and wet pinelands.

Harvest
Rootstock in fall.

Uses
In large doses, infusions have been used as emetics. Also used as a diaphoretic and expectorant.