Glossary of "Cladistics (2nd ed.)" by Kitching et al. (1998)
- (1) A character that can show two or more character states within the same individual, e.g. alleles. (2) A character that can show two or more states among different individuals of a taxon, e.g. colour forms of some species of butterfly.
Glossary of Plant Systematics (1st ed.) by Simpson (2006)
- A character that has valiable character state values within an OTU.
- Kitching, I. J., Forey, P. L. Humphries, C. J. & Williams, D. M. 1998. Cladistics, 2nd ed.: the Theory and Practice of Parsimony Analysis. -xii + 228 pp. Oxford University Press, New York.
- Simpson, M. G. 2006. Plant Systematics. -xi + 590 pp. Elsevier Academic Press, Oxford.