Austrian Yellowcress, Austrian Field-cress: Rorippa austriaca (Synonyms: Camelina austriacum, Cochlearia austriaca, Myagrum austriacum, Nasturium austriacum) -
Columbia Cress, Columbia Yellowcress, Columbian Yellowcress: Rorippa columbiae (Synonyms: Nasturtium columbiae, Nasturtium sinuatum, Nasturtium sinuatum var. columbiae, Radicula columbiae, Rorippa calycina, Rorippa calycina var. columbiae, Rorippa sinuata var. columbiae) - Flowers yellow, the petals 3-5 mm long. Plants of moist sites but rarely aquatic. Fruits round to widely oblong, less than 3 times as long as wide. Plants perennials.
Bluntleaf Yellowcress: Rorippa curvipes (Synonyms: Rorippa curvipes var. curvipes, Rorippa curvipes var. truncata) - Flowers yellow, with petals less than 3 mm long. Plants of moist sites but rarely aquatic. Fruits round to widely oblong, less than 3 times as long as wide. Plants taprooted annuals.
Curvepod Yellowcress, Lyrateleaf Yellowcress, Western Yellowcress, Western Yellow Cress: Rorippa curvisiliqua (Synonyms: Nasturtium curvisiliqua, Rorippa curvisiliqua var. curvisiliqua, Rorippa curvisiliqua var. lyrata, Rorippa curvisiliqua var. nuttallii, Rorippa curvisiliqua var. occidentalis, Rorippa curvisiliqua var. orientalis, Rorippa curvisiliqua var. procumbens, Rorippa curvisiliqua var. spatulata, Sisymbrium curvisiliqua) - Flowers yellow, with petals less than 3 mm long. Plants of moist sites but rarely aquatic. Fruits linear to narrowly oblong and at least 3 tims as long as wide. An annual or biennial pinnately divided but not compound leaves.
Variableleaf Yellowcress: Rorippa indica -
Bog Yellowcress, Hairy Marsh Yellowcress, Hispid Yellowcress, Marsh Yellowcress, Western Bog Yellowcress: Rorippa palustris ssp. hispida (Synonyms: Rorippa islandica var. fernaldiana, Rorippa islandica var. glabrata, Rorippa palustris ssp. occidentalis, Rorippa palustris var. glabra, Rorippa palustris var. occidentalis) - Flowers yellow, with petals less than 3 mm long. Plants of moist sites but rarely aquatic. Fruits linear to narrowly oblong and at least 3 times as long as wide.
Smooth Marsh Yellowcress, Bog Yellowcress, Marsh Yellowcress: Rorippa palustris ssp. palustris (Synonyms: Rorippa islandica var. fernaldiana, Rorippa islandica var. glabrata) -
Creeping Yellowcress, Shore Yellowcress: Rorippa sylvestris -