RESUMO -(Macrófitas aquáticas da lagoa de Jijoca de Jericoacoara, Ceará, Brasil). A lagoa de Jijoca de Jericoacoara situa-se no litoral do Ceará, Nordeste do Brasil (2°50'10'' e 2°55'32''S -40°28'32'' e 40°24'09''W), sendo bordejada em sua extremidade Norte por dunas e por vegetação de tabuleiro nas demais faces. Realizou-se o levantamento da composição florística e da estrutura da comunidade de macrófitas aquáticas presentes na lagoa. As amostras das plantas foram coletadas e depositadas no herbário EAC. Densidade, freqüência e cobertura das espécies foram amostradas em 10 transectos plotados em áreas com boas condições de conservação de suas margens, evitando-se áreas urbanas e de atividade agropecuária adjuntas à lagoa. Apresenta-se a lista de 45 espécies ocorrentes, suas formas biológicas e dados da estrutura da comunidade. As espécies com maior índice do valor de importância (IVI) foram Eleocharis mutata (L.) Roem. & Schult., Paspalidium geminatum Stapf, Eleocharis atropurpurea (Retz.) Kunth, Nymphoides indica (L.) Kuntze e Echinodorus tenellus (Mart.) Buchen. A forma de vida predominante foi "plantas enraizadas ao substrato -anfíbias tolerantes à seca". Em relação à profundidade, ocorre aumento da diversidade de espécies de áreas mais profundas para 0-0,5m de espessura da lâmina d'água. Palavras-chave -macrófitas aquáticas, terras úmidas, lagoas costeirasABSTRACT -(Aquatic macrophytes of Jijoca of Jericoacoara lagoon, Ceará, Brazil). The Jijoca of Jericoacoara lake is located at Ceará Coastal Zone, Northeast of Brazil (2°50'10'' e 2°55'32''S -40°28'32'' e 40°24'09''W), and it has sand dunes on the Northern shore and arboreal semi-deciduous vegetation around the other lakesides. A floristic and communities structure survey of aquatic flora was conducted. Plant samples were collected and included in the EAC Herbarium. The density, frequency, and cover were measurements used in describing communities by intercept transect sampling. Sampling was carried out in Jijoca of Jericoacoara lake at 10 localities, except areas with human impact, such as urban and agricultural areas. A list of 45 species, their life forms and vegetation structure are presented. The higher importance value index (IVI) species were Eleocharis mutata (L.) Roem. & Schult., Paspalidium geminatum Stapf, Eleocharis atropurpurea (Retz.) Kunth, Nymphoides indica (L.) Kuntze, and Echinodorus tenellus (Mart.) Buchen. The most common life-form was "emergent bottom-rooted plants with amphibious habit". In relation to depth, species diversity increased from the deeper areas and peaked at 0-0,5 m above water level.
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