References

Dallwitz, M. J. (1980). A general system for coding taxonomic descriptions. Taxon 29, 41-6.

Dallwitz, M. J., Paine, T. A., and Zurcher, E. J. (1993 onwards). User's guide to the DELTA System: a general system for processing taxonomic descriptions. 4th edition. http://delta-intkey.com/

Dallwitz, M. J., Paine, T. A., and Zurcher, E. J. (1995 onwards). User's guide to Intkey: a program for interactive identification and information retrieval. 1st edition. http://delta-intkey.com/

Dallwitz, M. J., Paine, T. A., and Zurcher, E. J. (2000 onwards). Principles of interactive keys. http://delta-intkey.com/

Radcliffe-Smith, A. (unpublished). The Genus Croton in Madagascar and Comoro Is.