Okay, if anyone can tell me the answer to this question, it will be one of our esteemed forum members. Does anyone know what the "C" stands for with both C35 and C32 rootstocks? I can make an educated guess - C stands for "Citrange"? But wondering if anyone actually knows the real answer? Just curious

I have no idea, but it could just stand for "Citrus".

Yup, that, too. Had a bit of an arguement (friendly) with one of the garden centers in my area about the origins of C35. They were trying to tell me that C35 was derived from Carrizo, and that's what the "C" stood for. I told him they are two different hybrids, and was he thinking of Troyer & Carrizo? So, next time I go down there, I'll provide him with the parents of both of these rootstocks, and hopefully the answer to what the "C" stands for

In early 1985, citrange hybrids 'C35' and 'C32' ('Ruby' orange X trifoliate orange) were released by the Citrus Research Center, Riverside, California, for trial as rootstocks because of their resistance to the citrus nematode, also to Phytophthora spp. and the tristeza virus. Therefore, the Citrus Research Center at Riverside, must have given the two varieties their name. An E-mail to the Research Center, should give the answer to Hooserquit's question.

Interesting trivia: In 1938, Swingle suggested the name Carrizo (Washington Navel x Poncirus trifoliata), 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. - Millet

Citrange 35
Citrange 32

In my opinion, whoever the person was that actually gave the two root stocks their names really choose two worthless names. Could have had better names, for example, after the person or persons that developed them. Not just a couple of flaky numbers. A little immagination would have been nice. - Millet

One of the original citations listed by USDA GRIN for these citranges is Hortscience 1986 Vol21 1.
This doesn't seem to be available online, or in any UK library. And there's no guarantee it contains the information you want.
However, there happens to be one copy currently available through Amazon US. I would have bought it at $13.99, but the postage to UK is too high to justify this. However, one of you over the pond may consider it worth buying - see
http://www.amazon.com/gp/offer-listing/B008NGX4X8/ref=sr_1_1_olp?s=books&ie=UTF8&qid=1365360200&sr=1-1&keywords=hortscience+1986&condition=used
If you do - send me a copy of the relevant pages!
Mike/Citrange

Thanks, all. Turtleman, are you guessing or do you know? Citrange, I'll look into the book, thank you. Just one of those random trivia questions plaguing my hobbyist mind.

I have a copy of the 1986 addition of Hortscience Vol. 21 1. It does have the C32 & 35 article, plus 4 or 5 other articles concerning citrus. The C32/C35 article has a lot of information on the two rootstocks, but does not have any information on how it got it name or what the "C" stands for. Citrange, if you want a copy of the article send me your E-mail address or your FAX number. Millet

Millet, The 1938 trivia about 'Troyer' and 'Carrizo' is often quoted in California, but is certainly not believed here in Florida, since they are not the same cultivar. While they look alike morphologically, 'Carizzo' had quite a lot of tolerance of burrowing nematode, whereas 'Troyer' had none. Unfortunately, due to resistance build-up by the nematode, 'Carrizo' has lost much of that resistance, but now we have 'Kuharske', a selection of 'Carrizo' that is again highly tolerant. California is lucky not to have burrowing nematode, so they would not notice the difference.