Citrus longispina

Citrus longispina (winged lime, blacktwig lime, or megacarpa papeda) is an unusual sweet lime-like citrus that has been classed as a papeda.

It is called Tai la mi san in Chinese, Taramisan in Japanese and Tanisan or Talamisan in the Philippines.

Description
Citrus longispina is an attractive citrus tree with striking colors: a background of dark-colored twigs, pale green leaves, and pale yellow fruit. Twigs are unusually dark brown, almost black, hence the name "blacktwig". The tree can reach 8 ft in height, and often has a spreading bushy appearance. Twigs are commonly long and bent down by the heavy fruit load.

Fruits comes in clusters and the flesh has a fair amount of natural sugar and a lime flavor. However it still lacks the intensity of acid found in more common citrus fruits, so some people might find it insipid. The fruit is spherical, about 8 cm in diameter. The tree has many long, strong thorns, as implicated from the botanical name, longispina.