Eleocharis geniculata (Capitate Spike Rush) is a species of annual herb in the family sedges. They have a self-supporting growth form. They are listed as endangered by COSEWIC. They are native to Alagoas, SãO Paulo, Santa Catarina, Distrito Federal, Rio Grande Do Sul, Caatinga, Puerto Rico, Piauí, Pernambuco, Pampa, Pacific Basin excluding Hawaii, Ceará, Tocantins, Amazônia, Espirito Santo, Mato Grosso, Canada, Pantanal, GoiáS, ParaíBa, Bahia, Rio De Janeiro, Minas Gerais, Paraná, U.S. Virgin Islands, Maranhao, Rio Grande Do Norte, Pará, Sergipe, Cerrado, The Contiguous United States, Roraima, Mato Grosso Do Sul, and Mata Atlântica. They have simple, broad leaves. Individuals can grow to 0.5 m.
EOL has data for 26 attributes, including: