which seed has the longest viability?

Question

viability means the capacity of a seed to germinate

Answer 1

ORTHODOX SEED:
Can be dried, without damage, to low moisture contents, usually much lower than those they would normally achieve in nature. Over a wide range of storage environments their longevity increases with reductions in both moisture content and temperature, in a quantifiable and predictable way.

Climate has a major influence on the evolution of seed production characteristics since the timing of flowering, pollination and seed development is crucial for successful seed production. Reproductive development include a period of obligate vegetative growth (juvenility), floral initiation, anthesis, pollination and seed development.
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Seeds of "Sacred Lotus, Nelumbo nucifera", hold the longest record of viability, 1,300 years.
READ MORE:
http://abstracts.aspb.org/pb2000/public/M15/1032.html

Answer 2

I might be proven wrong scientifically but I have always been impressed with the cocklebur (weed). As I understand it, some cocklebur seeds germinate the following year. Others are left to grow the second year. Still others in following years. All depending upon conditions in the spring time. And after all, thinking about it more, has anyone ever intentionally planted a cocklebur? If so, for what reason? And yet they have been around a long time.