Este estudo teve como objetivo realizar uma análise fitossociológica da composição herbácea e subarbustiva, das dunas no litoral norte da Bahia, com a finalidade de conhecer e caracterizar a comunidade do estrato herbáceo-subarbustivo. A área de estudo está localizada na praia de Massarandupió (12°19´12"S; 37°50´15"W), município de Entre Rios, Bahia. Para amostragem, foram alocadas 50 parcelas de 1m2 ao longo da área e calculados os dados fitossociológico, o índice de diversidade Shannon (H´), equabilidade de Pielou (J´) e riqueza total das espécies. Foram incluídos todos os indivíduos com hábito herbáceo e subarbustivo, sendo coletados 3.804 indivíduos, pertencentes a 12 espécies, distribuídas em nove famílias. As espécies Rhynchospora riparia, Chamaecrista ramosa, Eriocaulon sp. e Comolia ovalifolia apresentaram os maiores valores de importância (VI's). Os valores de (H') e (J') quando calculados com a cobertura vegetal foram, respectivamente, H'c = 1,453 nas/m² e J'c = 0,585. As dunas de Massarandupió apresentaram uma vegetação com ervas e subarbustos distribuídos em moitas. As famílias Fabaceae, Cyperaceae e Poaceae destacaram-se por apresentarem maior número de espécies, sendo predominantes em ambientes de praias, por se adaptarem facilmente em ambientes adversos assim como seu importante papel ecológico, auxiliando na fixação das dunas.ABSTRACTThis study aimed to carry out a phytosociological analysis of the herbaceous and sub-shrub composition of the dunes on the northern coast of Bahia, with the purpose of knowing and characterizing the herbaceous-subshrub community. The study area is located on the beach of Massarandupió (12°19 ́12"S; 37°50 ́15"W), municipality of Entre Rios, Bahia state. For sampling 50 plots of 1m 2 were allocated over the area and the phytosociological data, Shannon diversity index (H ́), Pielou equability (J ́) and total species richness were calculated. The individuals with herbaceous and sub-shrub habit were included in the present study. Were collected 3,804 individuals, belonging to 12 species, distributed in nine families. The species Rhynchospora riparia, Chamaecrista ramosa, Eriocaulon sp. and Comolia ovalifolia presentedthe highest importance values (IV's). The values of (H') and (J') when calculated with the vegetation cover were respectively, H'c = 1.453 nas/m² and J'c = 0.585. Massarandupió dunespresented vegetation with herbs and sub-shrubs distributed in thickets. The families Fabaceae, Cyperaceae and Poaceae stood out for presenting a greater number of species, being predominant in beach environments, for adapting easily in harsh environments as well as their important ecological role, assisting in the fixation of dunes.Keywords: Anthropization; herbaceous structure; Restinga; Northeast coastal vegetation.
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