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Citrus ID







Cultivar or taxon


Citrus x aurantium L., pro sp. [Sweet Orange Group] X Citrus trifoliata L. (sensu Mabberley 2004, Bayer et al. 2009); Citrus sinensis (L.) Osbeck x Poncirus trifoliata (L.) Raf. (sensu Swingle and Reece 1967; sensu Tanaka sec. Cottin 2002; sec. NPGS/GRIN 2010)



Hodgson (1967) noted that: "In 1923, Swingle had 200 seedlings of this then unnamed clone sent to the Winter Haven substation (No. 19) near Carrizo Springs, Texas. In 1938, he suggested it be named Carrizo, either forgetting that he had already given it the name Troyer in 1934, which seems unlikely, or because he failed to recognize its identity, which seems surprising."

The Chiefland Budwood Facility (2010) provided the following notes on the cultivar (clone F-52-16): "Seedling set at I-4 foundation grove in 1964. Carrizo is a USDA rootstock, cross between Washington navel and trifoliate orange developed near Carrizo Springs, Texas."



Crown compact or dense, not weeping. First-year twig surface glabrous; second- or third-year twig surface striate; thorns absent or not persistent; prickles absent or not persistent. Petiole glabrous, length medium; wings narrow, adjoining the blade. Leaflets one or three, margin bluntly toothed, rachis wings absent, shade leaflet blades weakly conduplicate, sun leaflet blades weakly conduplicate. Scent of crushed leaflets sweetly orange-like or somewhat to strongly malodorous. Fruit as broad as long or longer than broad; rind yellow (7-10), yellow-orange (11), or orange (12); rind texture slightly rough (4-5); firmness leathery; navel absent; flesh orange; taste sour.

Hodgson (1967) provided the following additional notes on the cultivar:

"Carrizo is indistinguishable from Troyer and of the same parentage. Savage and Gardner (1965) have recently presented convincing evidence that Carrizo and Troyer are in fact a single clone which originated as the zygotic seedling (CPB 4-5019) from a cross of Washington navel and trifoliate orange made by the senior author in 1909 under the direction of W. T. Swingle of the U.S. Department of Agriculture instead of two sister seedlings as had been assumed (Mortensen, 1954).

Bitters reports that its field performance has differed somewhat from Troyer, which is difficult to understand in light of the conclusions set forth above."



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.

Chiefland Budwood Facility. 2010. 2010 Annual report July 1, 2009 - June 30, 2010. Bureau of Citrus Budwood Registration, Florida Department of Agriculture & Consumer Services, Winter Haven.

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.

Mabberley, D.J. 2004. Citrus (Rutaceae): A review of recent advances in etymology, systematics and medical applications. Blumea 49: 481–498.

Mortensen, E. 1954. Citrus rootstocks in the Winter Garden area of Texas. Rio Grande Valley Horticultural Institute Proceedings 8: 13–22.

Savage, E.M. and F.E. Gardner. 1965. The Troyer and Carriso citranges. California Citrograph 50(3): 112–116.

Swingle, W.T. and P.C. Reece. 1967. The botany of Citrus and its wild relatives. In: Reuther, W., H.J. Webber, and L.D. Batchelor (eds.). The Citrus industry. Ed. 2. Vol. I. University of California, Riverside.



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Citrus ID Edition 2
October, 2011