Phenetic Analysis of 'Coryphantha', Section 'Robustispina' (Cactaceae), Part 1: Stem Characters;Final rept

摘要

A preliminary phenetic analysis was done to evaluate the taxonomic relationships within Coryphantha, section Robustispina, which includes C. robustispina ssp. robustispina, C. robustispina ssp. uncinata, C. robustispina ssp. scheeri, and C. poselgeriana. ANOVA, PCA, and DA procedures were performed on ten continuous stem characters for 14 populations and 447 individuals. Of primary concern was the taxonomic validity of the subspecific taxa within C. robustispina, with C. poselgeriana serving as out-group comparison. Data indicated that populations of C. robustispina ssp. scheeri represent a separate taxon and possibly a distinct species. Populations of both C. robustispina ssp. uncinata and C. robustispina ssp. robustispina are morphologically coherent within their respective taxa and are allopatric between the two taxa, thus indicating that they deserve taxonomic recognition. Individuals of C. poselgeriana were morphologically discrete from those of C. robustispina.