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  • Costus is a genus of perennial tropical herbaceous plants from the costus family. They are often characterized and distinguished from relatives such as Zingiber by their spiraling stems. The genus as a whole is thus often called spiral gingers, but this can also refer to C. barbatus specifically. Costus spectabilis is the floral emblem of Nigeria; its flowers are represented on its coat of arms. It is important not to confuse "Costus speciosus, C. spectabilis etc. with the herb known by the common name 'costus'. Some species are of importance to herbivores, such as caterpillars of the Restricted Demon which feed on Crape Ginger. The Crape Ginger is also a source of diosgenin, a compound used for the commercial production of various steroids, such as progesterone. In Trinidad and Tobago, a mix of Costus scaber juice and crushed Renealmia alpinia berries is used to treat dogs bitten by snakes.

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