Finally, I am about to figure out what is sak ip Longan is.
Google translate:
" Stone plaque (sak ip), and stone clips. According to legend, the earliest longan tree grew out in the cracks of the stone. The roots penetrated the rocky mountain and absorbed the underground "fine gas". The grown fruit was particularly delicious. The mother tree of the Dendrobium species, according to the study, was from an ancient longan tree in a stone crevice in Guangxi. Later generations successfully grafted 108 longan tree seedlings. The 108 longan trees are the female trees of the stone dragon longan, which are now in the mother garden. The stone dragon eye is named after it. Every year in mid-August, the midsummer season is good"