Bitter Orange is a name used to refer to several citrus or citrus-like fruit trees. Citrus aurantium ssp. amara is a spiny evergreen tree native to southern Vietnam but widely cultivated. Bitter oranges are also called sour, bigarade or Seville oranges. They are used as grafting stock for citrus trees, in herbal medicine, in marmalade, and in the liqueurstriple sec and curaçao.
Varieties
Bergamot (Citrus bergamia) is sometimes called Citrus aurantium ssp. bergamia.
Citrus is a common term and genus of flowering plant in the family Rutaceae, originating in tropical and subtropical southeast Asia.
Citrus is sometimes used as a food plant by the larvae of some Lepidoptera species including Common Emerald, Double-striped Pug, Giant Leopard Moth, Hypercompe eridanus, Hypercompe icasia and Hypercompe indecisa.
Citrus trees grown in tubs and wintered under cover were a feature of Renaissance gardens, once glass-making technology enabled sufficient expanses of clear glass to be produced.