The Tropical Fruit Forum

Somewhat theoretically speaking A hybrid of Poncirus and a Citrus does not necessarily have 50% Poncirus gene. an F2 like Eremoorgange or Eremocitrange not necessarily 25%.

With each new pollination there is a recombination of genes.

Which genes are expressed phenotypically varies from seedling to seedling. Therefore, hybrids vary greatly in their characteristics from seedling to seedling. Some have poncius traits, others less or not at all.

Percentages are purely hypothetical.

Probably only phenotypically a poncirus alike, but not in genotype. i was thinking the same.  If it inherits its hardiness, these could be promising hybrids.

I also found some hardier C35 seedlings even some monofoliates. But not as hardy as yours.

Fruits of Honghe Papeda seem to be interesting. Quite large and rather like a domesticated citrus fruit

https://figshare.com/articles/journal_contribution/Notes_on_the_morphological_diversity_ethnobotanical_uses_and_conservation_of_Citrus_hongheensis_Rutaceae_an_endemic_and_endangered_Papeda_from_southwest_China/22015556?file=39080414

https://figshare.com/articles/journal_contribution/Notes_on_the_morphological_diversity_ethnobotanical_uses_and_conservation_of_Citrus_hongheensis_Rutaceae_an_endemic_and_endangered_Papeda_from_southwest_China/22015556?file=39080408

Might be honghe papeda, figure one shows honghe county.

As I understand it it is classified as hongheensis in the article.
Is there a text to go with these pictures?

On the other hand weak roots are sometimes correlated with less thorns or precocious flowering. Just in case this is of interest.

I can not say. The seeds were given to me.

I think this phenomenon fits very well with the node count theory. Your trees have grown very fast and have reached the crucial height, that's why they are flowering .
From the reverse I can report that Poncirus hybrids here in northern Germany lack summer warmth and grow very slowly, mature poorly and often freeze back and stay immature for a long time.
Your trees have a long growing season a warm climate in the greenhouse and probably a good supply of nutrients. That speeds things up.
Ichangensis hybrids often start flowering on the lower branches first, interestingly ichangensis hybrids flower much faster and at lower heights than poncirush hybrids here even outside. In the greenhouse I had the first fruits in the 3rd summer at just about 1m height and that on the lower branches.
I think fast growth is very important, the genetic predispositions also play an important role and with fast growth these are fulfilled faster.

 Do you have any news on this topic?
Finally a received a Rose Anne. It started to flower around Christmas but lost it due to cold weather. I am eager to see if it will flower a second time in spring as promised.

Did you find it?

11 months from germination and it flowers? that is faster than I had hoped.

There are several varieties of citrumelo. They differ in taste, hardiness and so on. By and large, the rootstock is not very important for the taste. On closer look, there are some differences, but with citrumelos it's mostly a matter of whether they're edible at all....and this also depends on individual preferencies

P.polyandra is way less hardy than trifoliata. I would say -6°C is already a thread. I lost larger branches at -6°C.
It doesn't die at single-digit subzero temperatures, but it doesn't thrive either. I don't think it will survive -10°C.