• Armbruster WS, Pélabon C, Hansen TF, Mulder CPH. 2004. Floral integration, modularity, and precision: distinguishing complex adaptations from genetic constraints. In: PigliucciM, PrestonK, eds. Phenotypic integration: studying the ecology and evolution of complex phenotypes. New York, NY, USA: Oxford University Press, 2349.
  • Ashman T-L, Majetic CJ. 2006. Genetic constraints on floral evolution: a review and evaluation of patterns. Heredity 96: 343352.
  • Berg RL. 1960. The ecological significance of correlation pleiades. Evolution 14: 171180.
  • Chevrud JM, Wagner GP, Dow MM. 1989. Methods for the comparative analysis of variation patterns. Systematic Zoology 38: 201213.
  • Ordano M, Fornoni J, Boege K, Domínguez CA. 2008. The adaptive value of phenotypic floral integration. New Phytologist 179: 11831192.
  • Stuart A, Ord JK. 1987. Kendall's advanced theory of statistics, Volume 1. Distribution theory. New York, NY, USA: Oxford University Press.
  • Wagner GP. 1984. On the eigenvalue distribution of genetic and phenotypic dispersion matrices: evidence for a nonrandom organization of quantitative character variation. Journal of Mathematical Biology 21: 7795.