It's not a bulb, but is it a geophyte?
Sun, 23 Jan 2005 09:50:26 PST

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)…


Joe Shaw 

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