Habitat:
All within yearly flood level of the river. Unshaded lawn and sandy shore of river, with Rorippa sylvestris, Phyla lanceolata, Eragrostis hypnoides, Chaiturus marrubiastrum, Linernia dubia, Mimulus ringens, Eragrostus minor, E. pectinacea
Occurrence Remarks:
Erect, 1.2 m. tall. Flowers yellow.