The study of mandarins and their hybrids is important because of the reduced number of varieties commercially grown in Brazil and the large market this kind of citrus fruit can reach. The consumption of mandarins in Brazil is low mainly due to both the lack of consumer preference to eat this fruit and the restricted market offer during the winter. The characterization of mandarin varieties such as Thomas and Sul da África, which are similar to those commercially grown and ‘Murcott’ tangor, can contribute to an increased diversity of this crop plant. Research has demonstrated that although the Thomas variety grown in Cordeirópolis, State of São Paulo, Brazil, presents characteristics of a late season variety, with fruit maturity beginning in August and juice acidity above 0.9%, it can reach a specific consumer preference or also be suitable for juice processing. The variety Sul da África, another late season variety, produce fruits that are harvested at the beginning of July and may remain attached to the tree canopy for longer periods. Fruit harvest is still possible in October, with favorable ratio and high juice content. This represents a favorable characteristic for this later variety.