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Cyperus articulatus L. - syn. Cyperus niloticus Forssk. - Cyperaceae
jointed flatsedge, priprioca,
Perennial rhizomatous sedge, commonly growing in ponds, ditches, rivers, marshes, lakes and banks, with very wide pantropic distribution; „A decoction of rhizomes serves to treat aches. Remains found in archaeological sites indicate ancient uses since the Middle and Ancient Empires. The tuber has antiseptic properties and its paste is applied externally in cutaneous affections. It is used as a cane and to make essential oils.“
http://www.iucnredlist.org/details/full/164147/0
The bright yellow rhizome oils of C. articulatus (hydrodistillation, yield 0.5-1.0%) contained monoterpenes like alpha-pinene (0.7-12.9%), beta-pinene (0.4-7.4%), trans-pinocarveol (0.2-7.5%), trans-verbenol (0.2-2.7%), pinocarvone (0.1-1.9%) and myrtenal + myrtenol (0.3-7.7%). Main sesquiterpenes were ledol (3.2-8.8), caryophyllene oxide (4.6-23.3%), mustakone (7.3-14.5%), cyperene (0.6-4.3%), rotundene (0.4-0.8%), cypera-2,4-diene (0.1-0.3%), patchoulenone (0.5-1.6%), cyperotundone (2.1-6.7%) and alpha-cyperone (0.7-5.9%).
[Yield and chemical composition of the essential oil of the stems and rhizomes of cyperus articulatus L. cultivated in the state of Para, Brazil., Zoghbi, M.D.G.B., Andrade, E.H.A., Oliveira, J., Carreira, L. M.M., Guilhon, G.M.S., Journal of Essential Oil Research, 18(1), 10-12, 2006]
„The cosmetic use of this root, which grows naturally in the Amazon rainforest, is widespread in the North of Brazil, where it is part of the “banho de cheiro”, an aroma that is a key element of the Amazonian tradition.“
[A new ingredient: The introduction of priprioca in gastronomy., Atala, A., International Journal of Gastronomy and Food Science, 1(1), 61-63, 2012] http://www.sciencedirect.com/science/article/pii/S1878450X11000023