Siderasis is a genus of monocotyledonous flowering plants in the dayflower family, first described in 1837. It consists of a single known species, Siderasis fuscata, endemic to the State of Rio de Janeiro in southeastern Brazil, though it is also naturalized on the Island of Java in Indonesia.Giulietti & al. (2009). Plantas raras do Brasil: 1-496. Conservação International, Belo Horizonte, Mato Grosso, BrazilForzza, R. C. 2010. Lista de espécies Flora do Brasil http://floradobrasil.jbrj.gov.br/2010. Jardim Botânico do Rio de Janeiro, Rio de Janeiro
