Vegetable
Pachyrhizus
B tier
Pachyrhizus as a market umbrella covers yam bean species grown for tubers—primarily erosus jicama plus lesser-traded relatives. Labeling at genus level appears in seed and academic contexts more than produce stickers. Shared traits: crisp starch-water tubers, toxic mature seeds, tropical vines. Treat grocery tubers as standard jicama unless a specialty species is named. Genus-level identity links Mexican, Andean, and Asian yam bean crops. Culinary rules match: peel, raw crunch, brief cook only.
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History
Multiple American peoples domesticated different Pachyrhizus species for roots.
Colonial records noted yam beans under varied local names across the tropics.
Botanists unified yam beans under Pachyrhizus taxonomy.
Genus-level discussion supported biodiversity and breeding of yam beans.