For Citrus
Araújo, E.F. de, L.P. de Queiroz, and M.A. Machado. 2003. What is Citrus? Taxonomic implications from a study of cp-DNA evolution in the tribe Citreae (Rutaceae subfamily Aurantioideae). Organisms, Diversity & Evolution 3: 55-62.
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: Aurantoideae) using nine cpDNA sequences. Amer. J. Bot. 96: 668-685.
Brown, C.A. 1959. Vegetation of the Outer Banks of North Carolina. Louisiana State University Studies, Coastal Studies Series No. 4. La. State Univ. Press, Baton Rouge, LA. 179 pp.
Kubitzki, K., ed. 2011. The families and genera of vascular plants. X. Flowering plants – Eudicots – Sapindales, Cucurbitales, Myrtaceae. Springer, Berlin. 436 pp.
Mabberley, D.J. 1997. A classification for edible Citrus (Rutaceae). Telopea 7: 167-172.
Nesom, G.L. 2014a. Citrus trifoliata (Rutaceae): review of biology and distribution in the USA. Phytoneuron 2014-46: 1-14.
Pfeil, B.E., and M.D. Crisp. 2008. The age and biogeography of Citrus and the orange subfamily (Rutaceae: Aurantioideae) in Australasia and New Caledonia. Amer. J. Bot. 95: 1621-1631.
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