Which fruit has the most vitamin C?

The Kakadu plum, a small fruit native to northern Australia, contains extraordinarily high levels of vitamin C, in some measurements more than 50 times the amount found in oranges by weight. The camu camu, a berry from the Amazon, is another vitamin C powerhouse. By contrast, oranges, though famous for the nutrient, contain far less. Vitamin C is essential for the body to make collagen, heal wounds, and support the immune system, and humans cannot produce it themselves. A shortage causes the disease scurvy, once common among sailors on long voyages.