Sulfaweed, Broadleaf sumpweed

Iva annua L.

Asteraceae (Sunflower Family)


Sulfaweed is a native, warm-season annual in the Sunflower family. Also called broadleaf sumpweed, broadleaf marshelder, seacoast sumpweed and pelocote, the plant can grow from 2 to 6 feet tall. It has enough hair to be rough to the touch.

The leaves are situated in pairs across from each other on the stem. Each has three major veins visible on the lower or inner leaf.

Sulfaweed blooms in the summer and fall. A key characteristic is the presence of many small, leaflike bracts around every flower in the flowering stem.

The forage value of sulfaweed is fair for wildlife and, when the plant is young, fair for livestock.


This plant grows in moist soils in disturbed areas, roadsides and coastal bermudagrass pasture.