We made some changes almost two years ago when the Catalogue of Life listed T. patula as a synonym for T. erecta. Since then, that information has been nullified, and the COL lists the two as separate and distinct species. Some of the problems you're finding in the names of plants probably occurred when we changed "patula" to "erecta" and vice versa in an effort to keep up with the changes in taxonomic data. If you're certain that a name is incorrect, you can submit a proposal to edit the plant name.