How about Ground Pear, rather than Grand Pere?
As far as I can tell, Ground Pear refers to a potato, although I'm not sure
exactly which one.
This website might help to explain it:
website, but in English).
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I was recently in the rain forest of Rio (Brazil) and saw a beautiful
plant that the local guide referred to as Grand Pere. I can find no
references to this plant on the web. Has anybody ever heard of this
plant and know the correct botanical name?