 The different species and subspecies of teosinte can be readily distinguished based on morphological, cytogenetic, protein, and DNA differences and on geographic origin.The two perennials are sympatric and very similar and some consider them to be one species.What many consider to be the most puzzling teosinte is "Z. m. huehuetenangensis", which combines a morphology rather like "Z. m. parviglumis" with many terminal chromosome knobs and an isozyme position between the two sections.