What dialect/topolect is 凉薯 a part of?
According to Wiktionary:




柳州話 (Liuzhou Mandarin)
萍鄉話 (Pingxiang Gan)
南寧話 (Nanning Pinghua)
長沙話 (Changsha Xiang)
婁底話 (Loudi Xiang)


These topolects correspond to the areas highlighted in the light green circles above.