Jim Hill Mustard, Tall Rocket, Tumblemustard: Sisymbrium altissimum - Fruits spreading to spreading-ascending, longer than 15 mm long.
Hedge Mustard: Sisymbrium officinale (Synonyms: Erysimum officinale, Sisymbrium officinale var. leiocarpum, Sisymbrium officinale var. officinale) - Fruits erect, tightly appressed to the stem, shorter than 15 mm long.