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Pediomelum    is a genus endemic to North America comprising about 26 species, including themegalanthum    complex, which consists of    P.   megalanthum    and its varietiesretrorsum    andmegalanthum   ,    P.   mephiticum   , and the recently described    P.   verdiense    and    P.   pauperitense   . Historically, species of themegalanthum    complex have been variably recognized at the species or variety levels, dependent upon the relative importance of morphological characters as diagnostic of species. Ten quantitative morphological characters regarded as diagnostic at the species level were analyzed using multivariate morphometrics across these taxa in order to examine the discriminatory power of these characters to delineate species and to aid in species delimitation. The analyses support the recognition of    P.   megalanthum   ,    P.   mephiticum   , and    P.   verdiense    at the species level,    P.   retrorsum    as a variety under    P.   megalanthum   , and suggest the sinking of    P.   pauperitense    into    P.   verdiense   . The findings of the present study help quantify the power of certain characters at delimiting taxa and provide a basis for taxonomic revision of the    P.   megalanthum    complex.

Species delimitation and recognition in the Pediomelum megalanthum complex ( Fabaceae ) via multivariate morphometrics