The genus Oligactis (Kunth) Cass. is divided into two genera based on the two former subgenera and a new name was necessary for the non-typical subgenus. DNA sequence data have shown that these two groups are not sister taxa and that each is easily defined by morphological characters that include differences in the habit, position of the inflorescence, and the pubescence of the style branches. Sampera, with eight species, is named in honor of Dr. Cristián Samper, Director of the Natural History Museum, Smithsonian Institution.

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