Allergy Information

Since this genus is within the same tribe as ragweed, and plants are both insect- as well as wind-pollinated, allergenicity is a potential concern.

Genus Details

These shrubs, and sometimes small trees, grow to be 2-3 feet tall, with yellowish flowers. The leaves are narrow. They tend to grow in brackish marshes, in ditches and roadsides, wooded areas, or old fields.

Pollen Description

Baccharis pollen grains are oblate-spheroidal to prolate-spheroidal; the amb triangular, 3-4 lobate and 3-4 colporate. The sexine is generally thick, tectate, and has long spines. The intine is thin but slightly thickened below the apertures.

The grains are typically 20-30 micrometers in diameter.

Genus Distribution

The shaded areas on the map indicates where the genus has been observed in the United States.

- Native, observed in a county 

- Introduced, observed in a county 

- Rarely observed