Bush 2 Beach, there is not much information on the Black Twig Lime. I got some bud wood from Joe Real five years abo, who I assume got the bud wood from Gene Lester. below is the most information I've found about the variety.
-------------------------------------------------------------------------------------------
"Winged lime, is an unusual lime in that it has a fair amount of sugar, so it can be eaten out of hand by most people. Pleasant lime flavor. Fruit is globose, about 8 cm and gets ricey if left too long on the plant. Lots of long thorns, as the name implies.
Very unusual dark brown, almost black twigs. This color is retained in two- and sometimes three-year wood, the only citrus that I know of that has this characteristic. I called it "Blacktwig" for obvious reasons.
I planted some longispina seeds from UCR, and years later, when they first fruited, I could see that they were my Blacktwig, both from the fruit taste and dark twigs."
This information was given by Gene Lester, who grows this variety in Central California.
"Blacktwig" is one of the most beautiful and striking citrus trees I have seen. The deep violet-black twigs form a spectacular background for the pale green leaves and the pale yellow fruit. The Latin name longispina means long thorns and they are giant in size, by far the biggest and strongest thorns I have seen on a citrus tree, longer and thicker than on any trifoliate hybrid.
Gene's 8-foot tree has a spreading bushy appearance with slender long branches bending down under the weight of the fruit in heavy grapefruit-like clusters. It makes a beautiful ornamental plant and is very productive, but needs space. The taste is sweet but lacks acidity, some might say the fruit tastes a bit insipid. Definitely worth having as an ornamental and at least children like the plentiful fruit.
Winged lime is called Tai la mi san in Chinese and Taramisan in Japanese.
It is a great tasting lime, you can eat it out of hand.