clpP phylogeny before and after taxon addition. ML analysis was performed on an all-position nucleotide alignment using PAUP* as described in Methods with the TVM+G model used for both trees. A 60-bp 3' extension with questionable homology across taxa was removed in this analysis but was included in the original analysis. This is probably responsible for the change in the BP from 84% originally (not shown) to 70% here for Oenothera going with grasses in tree (A). Bootstrap values <50% are not shown. (A) Original taxon sampling; (B) after new taxa added.