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What's a Jamaica seed?
Heidi

http://en.wikipedia.org/wiki/Pachyrhizus_erosus

Mexican yam

Jicama is a large, bulbous root vegetable. A bulb may weigh one or two pounds and has a rough 'n' tough brown skin which should be peeled before eating or cooking. Inside, the flesh is white, wet and crunchy, similar to a raw potato but wetter and crunchier. The flavor is slightly sweet, a little nutty. It's good both raw and cooked, although my own favorite is raw, since it keeps both its crispness and its color over time. Look for it in the produce section