Sisymbrium loeselii (Small Tumbleweed Mustard)

At first identified as an "A" List species, Brassica elongata, Sisymbrium loeselii has been found in only one location on Magnolia, Twin Sisters Road. We have a good chance of eradicating it, as it seems to have a very local footprint.

 

Upon closer scrutiny, this plant looks quite different from Sisymbrium altissimum, which it superficially resembles.