I was wondering if anyone knew of any hybrid seedlings from Poncirus and Juanita tangerine that might be out there somewhere.

Also, if anyone knows of a source for Poncirus/changsha hybrids? I know 852 is one such hybrid...any others that people are aware of and where to find them?

Thanks!

Poncirus X Changsha is named HRS 899 it is very cold hardy and survived unprotected in Copenhagen Denmark. I have never heard off PT X Juanita. Another is US 639 (Poncirus Trifoliata X Cleopatra Mandarin)which is also very cold hardy.

where can 1 find these trees to buy

i don´t know in USA but in EU B.Voss in Hamburg, FLORENTSIA(My company), Bachés in france should have them.
/Martin

I read online that "HRS 899" is a zygotic seedling from seeds of US-852.

Bernhard Voss in Germany holds a sample of seedlings from a 899-fruit he got as a present from USDA. He has named these seedlings 899A to 899O (I suppose). Most of them have flowered already (except 899J)
Merry Christmas and a Happy New Year
Roberto

He (Voss) planted seeds from that fruit in 1997
info about seedlings from: http://www.agrumi-voss.de/

899 A : Monofol., Blatt wie Mex.Limette, glattrandig, aber Mandarinen-Blattgeruch, sehr schöner Wuchs, dekorativ, Jungsämling mit 10cm Größe hat `97/98 -8°C überlebt !
899 B : Mono.-trifoliat unregelmäßig, welliger Rand, gesägt, Jungsämling 97/98 genau so wie auch E, G, K, L, M, und N erfroren - Abveredelungen waren schon vorher gemacht und werden diesen Winter z.T. ein zweites Mal Frostgetestet.
899 C : Mono-trifoliat, sehr kleines (1x2cm), glattrandig abgerundetes Blatt
899 D : Trifoliat-monofoliat, leicht gezähnt, sehr schlanke Blätter, sehr buschig, wüchsig, hat ebenso wie 899A und 899J ´97/98 als kleinster Jungsämling überlebt!
899 E : Monofol., schlank, wellig, breiter und dünner als J, sehr dornig (4-5cm lang!)
899 F : Mono,-bi-trifoliat, Blatt glattrandig, mittelgroß, dünn,
899 G : Mono- bis trifoliat, abgerundet, sehr kleine Nebenblätter,
899 H : Meistens trifoliat, etwas stärker geflügelt,etwas breiteres Blatt als K
899 J : Monofol.,sehr schlank,zäh-dick,spatelförmiges Bl.,aufrechter Wuchs.
899 K : Meistens trifoliat, mandarinenähnliche, glattrandig schlanke Bl.
899 L : Mono,-bi-trifoliat, schlankes Blatt, glattrandig
899 M : Blatt wie Hybrid 119 (Variabel, abgerundet, mono-trifoliat), groß(wie 119)
899 N : Monofoliat, kleineres, gerundetes Blatt
899 O : Trifoliat, sehr große Blätter, leichte Blattstielflügelung, wüchsig
899 P :Mono-bis trifoliat, gesägt
899 Q: Trifoliat, wüchsig, ähnlich "O".
899 R: Monofoliat gezähntes Blatt

US 899 Citrandarin Citrandarin
HRS-899, HRS-899 J, US 899 A, US 899 F

Newly bred variety, the tests haven’t been finalized yet. It is a cross of tangerine variety 'Changsha' and Poncirus. It grows well and fast, has only simple leaves and is significantly hardier than the citranges 'Rusk' and 'Morton'. Its flowers are small, comparable to those of tangerines. B. Voss says about 15 clones labeled HRS and a capital letter, of which the clone 'HRS-899 J' is supposedly hardy to -15°C and the clone 'US 899 F' has much more vigorous growth. Its leaves mono-, di- and trifoliate and it’s a little bit hardier.
Millet (385 ABO-)

Thanks a lot for the interesting information!

Is US-899 available in the US? Does anyone have it? Would Dr. Bowman offer it? Is it possible to get seeds shipped from Germany?
Thank you everyone for all the information.

Here is page of one grower in Netherlands.
http://www.citrusbali.nl/Jaar2011.htm
He wrote about experiences during winter 2010/2011.
He tested following plants in pots:
Glenn Citrange;
HRS899A + HRS899F + HRS899J + HRS899K;
Citrus Junos;
Natsudaidai;
US119;
Curafora;
Morton Citrange;
Cunning Livurce;
Keraji Mandarin;
Citrange Sinton

following plants not survived winter in Netherlands outdoor without protection:
Glenn Citrange;
HRS899F + HRS899J + HRS899K
Citrus Junos
He is also selling grafted plants.

here is picture of one HRS899 clon on his webpage:
http://www.citrusbali.nl/vorstbest%20025.jpg

I have a little bit different experience with 899J.

My plant is more than 3 meters high, monofoliate leaves, big thorns, late start of growth in the spring. No bloom up to now
.
For 5 years in the open ground it turned out to be more resistant than Morton, Glenn, Thomasville and citremon. No damage after -13C.

Still, during the winter 2009/2010 after -16C and several weeks of frozen ground it was badly frostbitten close to poncirus graft point.
It is less hardy than Swingle5* and Ichangquat.

Greg Martin asked ........" if anyone knew of any hybrid seedlings from Poncirus and Juanita tangerine"................

Other than possibility creating a root stock variety, poncirus crosses result in fruit that the public would never purchase, as they simply do not produce fruit worth eating. Somewhere, by someone, just about every type of cross has been made. One in ten thousand might result in some value. Even most new non poncirus crosses that produced good tasting fruit, never had a chance of making it to commercial production, for various other reasons. Many of the new varieties over the years have actually resulted from chance seedlings, sports, and mutations. - Millet (384 ABO-)

For the first time my 899A and 899F bear fruits. They are not yet ripe but going to change colour. Fruit size is only 3cm (1inch?) I will report as soon as I was able to taste them. 899J has not bloomed till now.
/Roberto