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'''Quassia amara''' ('''amargoAmargo, bitterBitter-ash, bitterBitter-wood''') is a species in the genus Quassia, with some botanists treating it as the sole species in the genus. The genus was named by Carl Linnaeus who named it after the first botanist to describe it: the . The Surinamese freedman Graman Quassi. Q. amara is used as insecticide, in traditional medicine and as additive in the food industry. 

The main chemicals identified in amargo include: beta-carbolines, beta-sitostenone, beta-sitosterol, dehydroquassins, gallic acid, gentisic acid, hydroxyquassins, isoparain/.<ref name="chemical composition"/>

{{Leaf|simpleSimple|Alternate, Pinnate|Native to Brazil, Bitter Quassia ia a small forest tree, typically with a leaning stem, sometimes multiply-stemmed. Leaves are alternate, compound, with 3-5 leaflets, one terminal and the remaining in opposing pairs. The rachis between the leaflets is conspicuously winged. The leaves and bark have an unpleasant bitter flavor if chewed}}<ref name="Leaf"/>

{{Flower|Unisexual|15-25 cm long|whiteWhite|| The flowers are produced in a panicle 15-25 cm long, each flower 2.5-3.5 cm long, bright red on the outside, and white inside. They are tubes with a narrow mouth, somewhat wider at the base}}

{{Fruit|||Syncarp (sorosis) The fruit consists of 4-5 berries held together in a red receptacle; the fruits themselves are green, then turn black when maturing early in the dry season.|seeds Seeds many, ovoid.|}}

<ref name="chemical composition">[https://web.archive.org/web/20121220110825/http://rainforest-database.com/plants/amargo.htm "Wayback machine"]</ref><ref name="Leaf">[http://www.flowersofindia.net/catalog/slides/Bitter%20Quassia.html "evergreen"Morphology]</ref>