turpentine weed

noun5

1. •
   A plant of species Gutierrezia sarothrae.
2. •
   A plant of species Silphium perfoliatum, native to eastern and central North America.
3. •
   A plant of species Silphium terebinthinaceum
4. •
   A plant of species Trichostema lanceolatum, native to western North America.
5. •
   A plant of species Trichostema laxum.