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Citrus x aurantium L., pro sp. [Sour Orange Group] (sensu Mabberley 2004, Bayer et al. 2009); Citrus aurantium L. (sensu Hogdson 1967; sensu Tanaka sensu Cottin 2002)
Crown compact or dense, not weeping. First-year twig surface glabrous; second- or third-year twig striate; thorns absent or not persistent; prickles absent or not persistent. Petiole glabrous, length medium, wings medium or wide, adjoining the blade or tucking beneath blade. Leaflets one. Margin crenate/crenulate or bluntly toothed, shade leaflet blades flat or weakly conduplicate. Sun leaflet blades weakly conduplicate or strongly conduplicate. Scent of crushed leaflets spicy or peppery. Fruit broader than long; rind green-yellow (6), yellow (7-10), yellow-orange (11), or orange (12); rind texture medium rough (6-7) or rough; firmness leathery; navel absent; flesh orange; taste sour.
Bayer, R.J., D.J. Mabberley, C. Morton, C.H. Miller, I.K. Sharma, B.E. Pfeil, S. Rich, R. Hitchcock, and S. Sykes. 2009. A molecular phylogeny of the orange subfamily (Rutaceae: Aurantioideae) using nine cpDNA sequences. American Journal of Botany 96: 668–685.
Cottin, R. 2002. Citrus of the World: A citrus directory. Version 2.0. France: SRA INRA-CIRAD.
Hodgson, R.W. 1967. Horticultural varieties of Citrus. In: Reuther, W., H.J. Webber, and L.D. Batchelor (eds.). The Citrus industry, rev. University of California Press. http://lib.ucr.edu/agnic/webber/Vol1/Chapter4.html.
Mabberley, D.J. 2004. Citrus (Rutaceae): A review of recent advances in etymology, systematics and medical applications. Blumea 49: 481–498.
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