O presente estudo teve como objetivo listar a flora fanerogâmica de uma área de vegetação de restinga descrever suas fisionomias e analisar a similaridade com listas florísticas de outros estudos realizados nas restingas maranhenses. As coletas botânicas foram realizadas na restinga da praia de Itatinga (02°24’46.6”S, 44°24’01.7”W), município de Alcântara, Maranhão. As identificações das espécies e classificação das formas de vida seguiram a metodologia usual em estudos florísticos e as exsicatas foram incorporadas no Herbário MAR. A similaridade florística foi realizada através da análise de cluster, a partir do índice de Jaccard. Foram inventariadas 148 espécies, 122 gêneros e 54 famílias. As famílias mais ricas em espécies foram Fabaceae, Cyperaceae, Rubiaceae, Poaceae, Myrtaceae, Asteraceae, Euphorbiaceae, Malvaceae, Convolvulaceae e Lamiaceae. Foram encontradas 10 formas de vida, com destaque para os caméfitos (24,3%), nanofanerófitos e terófitos (22,2%) cada uma, e descritas três fisionomias: Campo aberto não inundável, Fruticeto aberto não inundável e Fruticeto fechado não inundável. A similaridade demonstrou maior afinidade da flora do presente estudo com a flora da restinga de Panaquatira devido à semelhança entre as feições fisionômicas. Todavia, são necessários mais estudos para compreender a semelhança entre as floras das restingas do Maranhão, juntamente com parâmetros ecológicos, para ampliar o conhecimento da flora e assim subsidiar projetos de conservação da vegetação do litoral maranhense. Floristic list and life forms of the vegetation of a restinga in Alcântara, western coast of Maranhão state, Northeast Brazil A B S T R A C TThe present study aimed to list the phanerogamic flora of a restinga vegetation area and describe its physiognomies and analyze the similarity with floristic lists of other studies carried out in restingas maranhenses. The botanical collections were performed in the restinga vegetation of Itatinga beach (02°24’46.6”S, 44°24’01.7”W), municipality of Alcântara, Maranhão State. Identification of species and classification of life forms followed the usual methodology in floristic studies and the exsiccates were incorporated into the Herbarium MAR. Floristic similarity was performed by cluster analysis using Jaccard index. A total of 148 species, 122 genera and 54 families were inventoried. The species richest families were Fabaceae, Cyperaceae, Rubiaceae, Poaceae, Myrtaceae, Asteraceae, Euphorbiaceae, Malvaceae, Convolvulaceae and Lamiaceae. Ten life forms were found, with emphasis on camephites (24.3%), nanophanerophytes and terophytes (22.2%) each. Three physiognomies are described: non-flooded open fields, non-flooded open scrub and non-flooded closed scrub. The similarity showed greater affinity of the flora of the present study with the flora of the Panaquatira restinga due to the similarity between the physiognomic features. However, further studies are needed to understand the similarity between the restingas floras of Maranhão State, with ecological parameters, to expand the knowledge of the flora and thus subsidize vegetation conservation projects of the Maranhão coast.Keywords: conservation, physiognomies, northeastern coast, similarity.
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