A Comparison of Aztekium and Strombocactus (Cactaceae)

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Abstract
Aztekium and Strombocactus, monotypic genera of Mexican cacti, have been considered to be congeneric. Studies in the field and laboratory dealt with habitat, distribution, flowers, fruits, outer cell layers of the stem, spines, pollen, and seeds. Although the genera are similar, particularly with regard to habitat and seeds, there are numerous distinguishing features. These two genera are compared to each other and to eight other genera of Cactinae in a table of 30 characters. Aztekium and Strombocactus should continue provisionally to be recognized as distinct genera.

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