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《现代汉语大词典》defines 凉薯 as:

方言。即豆薯。有的地方也叫地瓜。藤本植物, 花色浅蓝或白色, 结荚, 种子有毒, 块根像甘薯, 可食。

It was the 方言 part that threw me off here.

Baidu Baike just calls it a

别称

other resources also just say something like:

又名

I figured 凉薯 was just MSM but apparently it isn't.

What dialect/topolect is 凉薯 a part of? (if not Modern Standard Mandarin.)

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According to Wiktionary:

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  • 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.

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To my knowledge, 凉薯 is part of Modern Standard Mandarin. As far as I know people in 陕西(Shaanxi)、贵州(Guizhou) call it 地瓜.

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