Fifteen years ago I germinated several seeds collected from FD growing in Brookside Gardens, Maryland. The mother plant was rather dwarf and no other ponciruses or its hybrids were growing in vicinity.
I planted without division two twin seedlings from one seed. At this point they were almost the same in appearance. They grow very slowly and now are both flowering for the first time.
Their height is similiar and aside from the different size of their leaves they look like typical Flying Dragons.
The plant with flowers on the upper left part of the photo has very narrow leaves and started to flower well ahead my other ponciruses, almost two weeks ago. It has a very small flowers that are creamy in the beginning.
Its sibling is on the bottom left , it does has leaves and flowers similiar to other Flying Dragons
From left to right: flowers of a regular large flower poncirus, tiny flower FD, its sibling and my another Flying Dragon
Interesting results, it looks like one with bigger flowers is nucellar clone and second maybe inbred from self-pollination? I wonder if the small flower clone will have also very small fruits, perhaps bellow 3 cm... I also have one very dwarf FD seedling, with first very small flower this year. Seedling germinated in spring 2017 and it's height is only 24cm (9.4 inches), flower has width only 0,5 cm(0,2 inches)
Mother tree of this seedling is my Flying dragon, I am sure there was no cross pollination with other citrus or trifoliata:
This mother tree gives every year ~ 10-15% more vigorous regular trifoliata seedlings, you are right about spines of this precocious FD, but branches grow more horizontally and are curved, some spines are very slightly curved too, maybe it is somewhere between Flying dragon and poncirus trifoliata.
but more importantly Flying Dragon sounds better it is wery dwarf, leaves are red in autumn and even flowers have some reddish tone so I named it Flying Dragon "Red Dwarf" so ssh
> This mother tree gives every year ~ 10-15% more vigorous regular trifoliata seedlings This is the normal way it goes. The genetic of transmitting the FD character is complex. It implies three genes, one on the chromosomes and two in the chloroplasts or mitochondria. I don't remember exactly but I'm sure Ilya11 will find the article.