 This species is normally associated with serpentine soils in grassland communities that are generally species-rich for serpentine soils; the area they are growing in on the San Francisco Peninsula also contains sloping chaparral.Other native species that grow in the same area include "Nasella pulchra", "Delphinium hesperium", and "Hemizonia congesta var.luzulifolia", plus the exotic "Lolium multiflorum".