Abstract

A cladistic analysis based on 63 morphological characters was carried out on the tribe Colletieae including two presumed closely related genera, Geanothus and Noltea as outgroupS. In addition to a parsimony analysis of the equally weighted characters, analyses investigating the effects of character weighting, removal of a presumed hybrid species as well as the impact of uncertainly scored characters were undertaken. In all analyses Noltea was placed as sister group to a well supported monophyletic Colletieae. Nineteen different in group topologies were found, with the additional analyses mainly supporting two of them. Within the Colletieae a basal dichotomy divides Trevoa and Retanilla from the remainder of the tribe. While the Trevoa-Retanilla clade is fully resolved, the second lacks detailed resolution. Within this clade the Colletia species from a well supported monophyletic group, while monophyly of the disjunct genus Discaria could not be confirmed.

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