Richest source of vitamin C is

The richest source of vitamin C is Barbados Cherry.
This cherry possesses the highest content of vitamin C of any plant-derived fruits/berries, 100 g of fresh berries provide astoundingly 1677.6 mg of vitamin C; which is about 1864% of the daily recommended intake.
Barbados cherry also provides some vitamin A (37.2 mcg or 4% of the DV), 0.06 mg of riboflavin (4.6% of DV), 0.4 mg of niacin (or 2.5% of DV), 0.02 mg of thiamin (1.6% of the DV) and smaller amounts of calcium and iron.