1. Bessey, C. E., 1915: The phylogenetic taxonomy of flowering plants. ? Ann. Missouri Bot. Gard.2, 109?164.
2. Coombs, E. A. K., Donoghue, M. J., McGinley, R. J., 1981: Characters, computers and cladograms: A review of the Berkeley cladistics workshop. ? Syst. Bot.6, 359?372.
3. Coulter, J., Rose, J., 1888: North AmericanUmbelliferae. ? Wabash College, Crawfordsville, Indiana.
4. Cronquist, A., 1981: An Integrated System of Classifications of Flowering Plants. ? New York: Columbia Univ. Press.
5. Davis, P., Heywood, V., 1973: Principles of Plant Taxonomy. ? Edinburgh: Oliver & Boyd.