Abstract
Methods for cladistic character compatibility analysis have required a priori estimates of the direction of evolutionary trends among the states of a character, in order to ensure consistency. Results are presented here that can enable comparative biologists, if they choose, to proceed with cladistic character analysis without a priori estimates of the direction of evolutionary trends. Specifying only undirected character state trees is sufficient to ensure the compatibility of a collection of characters each pair of which is compatible. The results have been implemented in a computer program, for which a FORTRAN source deck is available.
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