Citrus bigaradia

Occurs in the ant Myrmecia gulosa and the flowers of Citrus bigaradia. 

Link, syn. Citrus bigaradia Loisel, syn. Citrus vulgaris Risso orange petitgrain oil twigs with sometimes little green fruits... 

Petitgrain oil, obtained by distillation of the twigs and unripe fruit of Citrus bigaradia. There are two varieties of the oil, the French and the South American, the former being the more valuable. Specific gravity at 15° C., 0 886-0 900 optical rotation, -3° to + 6° refractive index at 20° C., 1 4604-1 4650 esters, calculated as linalyl acetate, 40-55 per cent., for the best qualities usually above 50 per cent. soluble as a rule in 2-3 volumes of 70 per cent, alcohol, but occasionally requires 1-2 volumes of 80 per cent, alcohol. 

The bitter or Seville orange is known as Citrus bigaradia (Duhamel), Citrtis aurantium var. amara (Linnaeus), and Citrus vulgaris (Risso), of which some twelve varieties are known. The sweet or Portu orange is known as Citrus aurantium (Eisso), of which no fewer than nineteen varieties are known. 

Citrus aurantium L. ssp. amara or Citrus bigaradia R. Rutaceae... 

ISO/DIS 3064 , Essential oil of petitgrain, Paraguayan type (Citrus aurantium L. var. Paraguay (syn. Citrus aurantium var. bigaradia Hook f.)), ISO, 2010, Geneva, Switzerland, http //www.iso.org (accessed January 2014). 

Source Bitter orange Citrus aurantium L. (syn. C. aurantium L. ssp. amara (L.) Engl. C. vulgaris Risso C. bigaradia Risso) Sweet orange Citrus sinensis (L.) Osh. (syn. C. aurantium L. var. sinensis L. C. aurantium L. var. dulcis Pers. C. aurantium L. ssp. dulcis L. C. aurantium Risso ssp. sinensis Engl.) (Family Rutaceae). 

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