Hydroidea is a genus of flowering plants in the family Asteraceae.Karis, Per Ola. 1990. Botanical Journal of the Linnean Society 102(1): 29Tropicos, Hydroidea elsiae (Hilliard) P.O. Karis
Species There is only one known species, Hydroidea elsiae, native to the Cape Provinces of South Africa.Gibbs Russell, G. E., W. G. M. Welman, E. Retief, K. L. Immelman, G. Germishuizen, B. J. Pienaar, M. Van Wyk & A. Nicholas. 1987. List of species of southern African plants. Memoirs of the Botanical Survey of South Africa 2(1–2): 1–152(pt. 1), 1–270(pt. 2).
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