Hi,

One cactus that I grow produces underground tubers (I suppose they are tubers
and not rhizomes, etc.). The root system reminds me of a Dahlia, but the
enlarged roots tend to be long and cylindrical in shape.

LINK: Opuntia macrorhiza and roots (pads shriveled for winter)
http://members.aol.com/PlantStudy/omac/…

Cordially,

Joe Shaw
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