i am very sure those pictures above is some of longan cultivar called "ping pong longan" (here in indonesia) it names refer to its huge size, sometimes were just simply sized as a ping pong ball. we belive that its irigins from vietnam and they called it Xuo Chom Fang or something like that. this longan variety was very unique since not like many other longan,this ping pong longan were extremly tropical. it doesn need any chill hour to induce flowering. just little drought and lot of sun shine....it will bear fruit, and its realy early bearing. they start to bear fruit at 3 years when grow from seed, and even grafted tree can be fruiting in 6 month!
in indonesia we known few cultivar of tropical longan : pingpong, white longan (both were huge and intoduce from vietnam) diamon river and chrystal (introduce from malaysia) and two local selection.
you can see the image if those longan by googling it in bahasa keyword : lengkeng pingpong, lengkeng aroma durian, lengkeng diamond river.
