What does 'English Large' refer to in the form of Poncirus trifoliata 'English Large'? I've been told it has large fruit by some people while other people state it has large flowers.

This study claims the flower size of 'English Large' has small flowers.

I've not heard of that name given to a Poncirus Trifoliate, but there is large and small Flowered Poncirus type. I bet it is a name refering to the type of flower. - Millet

I have wondered that also. However a Google search for Poncirus images comes up with leaves that do not look like the standard leaf, they are larger. This picture is from England.

thanks for the replys.........I have a bunch of PT 'English Large' seedlings growing.........I guess we'll see what they look like later this year. After last season they look similar to 'regular' PT's...............assuming I have the 'real' english large PTs.

trifoliate orange rootstock selections have been generally divided into two groups based on flower size. Trees on small-flowered trifoliate orange selections like Rubidoux are typically 15% to 20% smaller at maturity than trees on large-flowered selections like Pomeroy. In California, where dwarfing citrus rootstocks have been widely used, 8-to-12-year-old navel and Valencia oranges, Minneola tangelos, and Dancy tangerines on Rubidoux trifoliate orange rootstock at different sites ranged from 10 to 14 feet tall. Comparable trees on Pomeroy trifoliate rootstock were predicted to be 15%-20% taller, about 12 to 17 feet.

http://edis.ifas.ufl.edu/hs221

There is an English Small and an English Large. They both have small flowers.

This article at least explains about the source of some of the different selections.

http://ucce.ucdavis.edu/files/repositoryfiles/ca1505p10-64851.pdf

They used 33 different Trifoliate Orange cultivars in the study. I did find it rather odd that Flying Dragon was not included, unless perhaps FD could possibly be one of the numbered varieties, but I don't think it is. Anyway, It was an interesting article. - Millet.

This source may have already been referenced:

http://www.citrusvariety.ucr.edu/links/documents/Bitters.pdf

Bottom of pg. 31; figure 5 is on pg. 173

Best,

Skinn30a

There are certainly no named varieties of Poncirus in England. Although it grows here quite happily, it is quite rare. Perhaps the seed of these varieties came from England, or perhaps the grower.
Through the wonders of Googles Image Search, I have found that the picture posted by 'hardyvermont' actually originates from somewhere in Ireland. With their mild winters, cool summers and high rainfall I guess that any variety in Ireland could look considerably different from the same one grown in more continental USA climates.

HardyVermont's picture even looks Irish. Ireland a GREAT COUNTRY with very friendly people. - Millet