The relative lability of floral vs nonfloral cha

Authors: PRATHER L ALAN

Publish Date: 1999/12/01

Volume: 131, Issue: 4, Pages: 433-450

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Abstract

L ALAN PRATHER The relative lability of floral vs nonfloral characters and a morphological phylogenetic analysis of Cobaea Polemoniaceae Botanical Journal of the Linnean Society Volume 131 Issue 4 December 1999 Pages 433–450 https//doiorg/101111/j109583391999tb01525xThe relative levels of lability in floral vs vegetative characters have been suggested to give insight into the mechanisms of adaptation and speciation Cobaea Polemoniaceae exhibits a remarkable diversity in floral form A morphologybased phylogeny was constructed and is congruent in most regards with a previously published molecular phylogeny but significant incongruence was found in the placement of two taxa A combined analysis was performed excluding C aquatoriensis and C lutea and was nearly identical to the molecular analysis The phylogenies are compatible with a recently published classification Incongruencies between the phylogenies within section Rosenbergia may have profound implications for floral evolution A simple method for testing the levels of homoplasy as an indicator of lability between two classes of data is developed and used to test for differences between floral and nonfloral classes of characters The method is based on repeated randomization of the data into partitions and recalculation of a test statistic defined as the difference between consistency index CI values of the data in each partition over a given tree The null hypothesis that the floral characters are no more homoplasious than the nonfloral characters cannot be rejected P=009

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