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water was recently discovered on planet mars
buckyballs, buckytubes or nanotubes are the recently discovered forms of carbon from 1950s.
plants
I don't know what you mean by "recently". It was discovered in the 1500's by the Spaniards.
That would be UB313, discovered in 2005,
water
about 403.
Ununoctium
The latest confirmed element discovered was Livermorium, 116Lv, in 2000. Ununseptium is not officially credited as "discovered" by the IUPAC/IUPAP Joint Working Party, but it is the most recently synthesized element, made in 2010.
wind
The West African legume, Millettia thonningii is a more recently discovered molluscicide source.
Antarctica is the most recently discovered continent.