this is mostly true. There are a few citrus varieties that until recently werent widely commercially cultivated. A prominent one is the cumquat, and there are a

this is mostly true. There are a few citrus varieties that until recently werent widely commercially cultivated. A prominent one is the cumquat, and there are a couple of native Australian citrus species that are now beginning to be cultivated that are not cultivars of the 3 core citrus species.