Camu Camu (Myrciaria dubia) is a small bushy riverside tree from the Amazon rainforest in Peru. which grows to a height of 3–5 m (9.8–16.4 ft) and bears a red/purple cherry-like fruit. It is a close relative of the jabuticaba (Myrciaria cauliflora) and the guavaberry or rumberry (Myrciaria floribunda). The high vitamin C content, on the order of 2–3% of fresh weight, is the most important property of the fruit. Camu camu has small flowers with waxy white petals and a sweet-smelling aroma. It has bushy, feathery foliage. The evergreen, opposite leaves are lanceolate to elliptic. Individual leaves are 3–20 cm (1.2–7.9 in) m in length and 1–2 cm (0.39–0.79 in) wide.
It is rich in flavonoids, such as anthocyanins, flavonols and flavanols, catechins, delphinidin 3-glucoside, cyanidin 3-glucoside, ellagic acid, and rutin; other analysis revealed the presence of gallic and ellagic acids, suggesting that the fruit possesses hydrolyzed tannins (gallo- and/or ellagitannins).

(Source: Wikipedia).