Citrus fruits usually have a tangy, sweet, or sour taste to them and they usually contain a ton of ascorbic acid, or Vitamin C Citrus fruit come from plants in the Rutacae family. The name citrus...
They somewhat resemble a citrus fruit, but I don't think fresh ones actually contain citric acid. Canned or preserved ones will probably have cirtic acid as a preservative.
Yes, there is.
An ugli fruit looks like a small grapefruit with very juicy sweet flesh and a fragrant skin. It tastes like a satsuma crossed with a grapefuit and has a very sweet citrus flavour.