@article{WillisBurkill2008,
  author    = {John Christopher Willis and Isaac Henry Burkill},
  title     = {Flowers and insects in Great Britain : part 2, observations on the natural orders Dipsacaceae, Plumbaginaceae, Compositae, Umbelliferae and Cornaceae, made in the Clova Mountains},
  journal   = {Annals of botany},
  volume    = {17},
  pages     = {313 -- 349},
  year      = {2008},
}