The ragwort flower, or Ligularia, should not be confused with the toxic pasture weed ragwort, which is in the Senecio genus. The ragwort plants we are talking about have large toothed or notched leaves and produce spires of yellow flowers in late summer. The plants have a mounding habit, with some species carrying the foliage on long petioles. The name is derived from the Latin “ligula,” which means little tongue, and refers to the shape of the florets on the flower spire. Ligularia plant information on propagation indicates the plants may grow from seed or division.